Here is, I. The great zeal and industry of Moses as a magistrate.
1. Having been employed to redeem Israel out of the house of bondage, herein he is a further type of Christ, that he is employed as a lawgiver and a judge among them. (1.) He was to answer enquiries, to acquaint them with the will of God in doubtful cases, and to explain the laws of God that were already given them, concerning the sabbath, the man, etc., beside the laws of nature, relating both to piety and equity, Exo 18:15. They came to enquire of God; and happy it was for them that they had such an oracle to consult: we are ready to wish, many a time, that we had some such certain way of knowing God's mind when we are at a loss what to do. Moses was faithful both to him that appointed him and to those that consulted him, and made them know the statutes of God and his laws, Exo 18:16. His business was, not to make laws, but to make known God's laws; his place was but that of a servant. (2.) He was to decide controversies, and determine matters in variance, judging between a man and his fellow, Exo 18:16. And, if the people were as quarrelsome one with another as they were with God, no doubt he had a great many causes brought before him, and the more because their trials put them to no expense, nor was the law costly to them. When a quarrel happened in Egypt, and Moses would have reconciled the contenders, they asked, Who made thee a prince and a judge? But now it was past dispute that God had made him one; and they humbly attend him whom they had then proudly rejected.
2. Such was the business Moses was called to, and it appears that he did it, (1.) With great consideration, which, some think, is intimated in his posture: he sat to judge (Exo 18:13), composed and sedate. (2.) With great condescension to the people, who stood by him, Exo 18:14. He was very easy of access; the meanest Israelite was welcome himself to bring his cause before him. (3.) With great constancy and closeness of application. [1.] Though Jethro, his father-in-law, was with him, which might have given him a good pretence for a vacation (he might have adjourned the court for that day, or at least have shortened it), yet he sat, even the next day after his coming, from morning till evening. Note, Necessary business must always take place of ceremonious attentions. It is too great a compliment to our friends to prefer the enjoyment of their company before our duty to God, which ought to be done, while yet the other is not left undone. [2.] Though Moses was advanced to great honour, yet he did not therefore take his case and throw upon others the burden of care and business; no, he thought his preferment, instead of discharging him from service, made it more obligatory upon him. Those think of themselves above what is meet who think it below them to do good. It is the honour even of angels themselves to be serviceable. [3.] Though the people had been provoking to him, and were ready to stone him (Exo 17:4), yet still he made himself the servant of all. Note, Though others fail in their duty to us, yet we must not therefore neglect ours to them. [4.] Though he was an old man, yet he kept to his business from morning to night, and made it his meat and drink to do it. God had given him great strength both of body and mind, which enabled him to go through a great deal of work with ease and pleasure; and, for the encouragement of others to spend and be spent in the service of God, it proved that after all his labours his natural force was not diminished. Those that wait on the Lord and his service shall renew their strength.
II. The great prudence and consideration of Jethro as a friend.
1. He disliked the method that Moses took, and was so free with him as to tell him so, Exo 18:14, Exo 18:17, Exo 18:18. He thought it was too much business for Moses to undertake alone, that it would be a prejudice to his health and too great a fatigue to him, and also that it would make the administration of justice tiresome to the people; and therefore he tells him plainly, It is not good. Note, There may be over-doing even in well-doing, and therefore our zeal must always be governed by discretion, that our good may not be evil spoken of. Wisdom is profitable to direct, that we may neither content ourselves with less than our duty nor over-task ourselves with that which is beyond our strength.
2. He advised him to such a model of government as would better answer the intention, which was, (1.) That he should reserve to himself all applications to God (Exo 18:19): Be thou for them to God-ward; that was an honour in which it was not fit any other should share with him, Num 12:6-8. Also whatever concerned the whole congregation in general must pass through his hand, Exo 18:20. But, (2.) That he should appoint judges in the several tribes and families, who should try causes between man and man, and determine them, which would be done with less noise, and more despatch, than in the general assembly wherein Moses himself presided. Thus they must be governed as a nation by a king as supreme, and inferior magistrates sent and commissioned by him, Pe1 2:13, Pe1 2:14. Thus many hands would make light work, causes would be sooner heard, and the people eased by having justice thus brought to their tent-doors. Yet, (3.) An appeal might lie, if there were just cause for it, from these inferior courts to Moses himself; at least if the judges were themselves at a loss: Every great matter they shall bring unto thee, Exo 18:22. Thus that great man would be the more serviceable by being employed only in great matters. Note, Those whose gifts and stations are most eminent may yet be greatly furthered in their work by the assistance of those that are every way their inferiors, whom therefore they should not despise. The head has need of the hands and feet, Co1 12:21. Great men should not only study to be useful themselves, but contrive how to make others useful, according as their capacity is. Such is Jethro's advice, by which it appears that though Moses excelled him in prophecy he excelled Moses in politics; yet,
3. He adds two qualifications to his counsel: - (1.) That great care should be taken in the choice of the persons who should be admitted into this trust (Exo 18:21); they must be able men, etc. It was requisite that they should be men of the very best character, [1.] For judgment and resolution - able men, men of good sense, that understood business, and bold men, that would not be daunted by frowns or clamours. Clear heads and stout hearts make good judges. [2.] For piety and religion - such as fear God, as believe there is a God above them, whose eye is upon them, to whom they are accountable, and of whose judgment they stand in awe. Conscientious men, that dare not do a base thing, though they could do it ever so secretly and securely. The fear of God is that principle which will best fortify a man against all temptations to injustice, Neh 5:15; Gen 42:18. [3.] For integrity and honesty - men of truth, whose word one may take, and whose fidelity one may rely upon, who would not for a world tell a lie, betray a trust, or act an insidious part. [4.] For noble and generous contempt of worldly wealth - hating covetousness, not only not seeking bribes nor aiming to enrich themselves, but abhorring the thought of it; he is fit to be a magistrate, and he alone, who despiseth the gain of oppressions, and shaketh his hands from the holding of bribes, Isa 33:15. (2.) That he should attend God's direction in the case (Exo 18:23): If thou shalt do this thing, and God command thee so. Jethro knew that Moses had a better counsellor than he was, and to his counsel he refers him. Note, Advice must be given with a humble submission to the word and providence of God, which must always overrule.
Now Moses did not despise this advice because it came from one not acquainted, as he was, with the words of God and the visions of the Almighty; but he hearkened to the voice of his father-in-law, Exo 18:24. When he came to consider the thing, he saw the reasonableness of what his father-in-law proposed and resolved to put it in practice, which he did soon afterwards, when he had received directions from God in the matter. Note, Those are not so wise as they would be thought to be who think themselves too wise to be counselled; for a wise man (one who is truly so) will hear, and will increase learning, and not slight good counsel, though given by an inferior. Moses did not leave the election of the magistrates to the people, who had already done enough to prove themselves unfit for such a trust; but he chose them, and appointed them, some for greater, others for less division, the less probably subordinate to the greater. We have reason to value government as a very great mercy, and to thank God for laws and magistrates, so that we are not like the fishes of the sea, where the greater devour the less.
III. Jethro's return to his own land, Exo 18:27. No doubt he took home with him the improvements he had made in the knowledge of God, and communicated them to his neighbours for their instruction. It is supposed that the Kenites (mentioned in Sa1 15:6) were the posterity of Jethro (compare Jdg 1:16), and they are there taken under special protection, for the kindness their ancestor here showed to Israel. The good-will shown to God's people, even in the smallest instances, shall in no wise lose its reward, but shall be recompensed, at furthest, in the resurrection.

Able men - Persons of wisdom, discernment, judgment, prudence, and fortitude; for who can be a ruler without these qualifications? Such as fear God - Who are truly religious, without which they will feel little concerned either for the bodies or souls of the people.
Men of truth - Honest and true in their own hearts and lives; speaking the truth, and judging according to the truth.
Hating covetousness - Doing all for God's sake, and love to man; laboring to promote the general good; never perverting judgment, or suppressing the testimonies of God, for the love of money or through a base, man-pleasing spirit, but expecting their reward from the mercy of God in the resurrection of the just.
Rulers of thousands, etc. - Millenaries, centurions, quinquagenaries, and decurions; each of these, in all probability, dependent on that officer immediately above himself. So the decurion, or ruler over ten, if he found a matter too hard for him, brought it to the quinquagenary, or ruler of fifty; if, in the course of the exercise of his functions, he found a cause too complicated for him to decide on, he brought it to the centurion, or ruler over a hundred. In like manner the centurion brought his difficult case to the millenary, or ruler over a thousand; the case that was too hard for him to judge, he brought to Moses; and the case that was too hard for Moses, he brought immediately to God. It is likely that each of these classes had a court composed of its own members, in which causes were heard and tried. Some of the rabbins have supposed that there were 600 rulers of thousands, 6000 rulers of hundreds, 12,000 rulers of fifties and 60,000 rulers of tens; making in the whole 78,600 officers. But Josephus says (Antiq., lib. iii., chap. 4) that Moses, by the advice of Jethro, appointed rulers over myriads, and then over thousands; these he divided into five hundreds, and again into hundreds, and into fifties; and appointed rulers over each of these, who divided them into thirties, and at last into twenties and tens; that each of these companies had a chief, who took his name from the number of persons who were under his direction and government. Allowing what Josephus states to be correct, some have supposed that there could not have been less than 129,860 officers in the Israelitish camp. But such computations are either fanciful or absurd. That the people were divided into thousands, hundreds, fifties and tens, we know, for the text states it, but we cannot tell precisely how many of such divisions there were, nor, consequently, the number of officers.

And let them judge the people at all times,.... In their several districts, whenever a matter of difference between man and man arises, and the case is brought before them, let them judge impartially between them, and determine what is right and wrong, and execute judgment and justice truly; which would take off a great deal of business from the hands of Moses:

and it shall be that every great matter they shall bring to thee; any affair of great importance, and difficult of determination, and about which the judges may have some doubt in their minds, and they are not clear as to the decision of it; this, they the judges, not the people, were to bring to Moses:

but every small matter; which is of no great importance, or is easy of decision, where the right and the wrong clearly appear, and there is no difficulty in the determination of it:

so shall it be easier for thyself; to go through the business that would be necessarily devolved upon him, as the chief ruler and governor, supreme judge, lawgiver, leader, and commander:

and they shall bear the burden with thee; of ruling and judging the people; they taking a share of it, it would sit the lighter and easier upon him; and the whole seems to be wise and prudent counsel.

Moses' father-in-law said unto him, The thing . . . is not good--not good either for Moses himself, for the maintenance of justice, or for the satisfaction and interests of the people. Jethro gave a prudent counsel as to the division of labor [Exo 18:21-22], and universal experience in the Church and State has attested the soundness and advantages of the principle.