David here lets us know, 1. How he was discouraged in his duty by the fear of man: Princes persecuted him. They looked upon him as a traitor and an enemy to the government, and under that notion sought his life, and bade him go serve other gods, Sa1 26:19. It has been the common lot of the best men to be persecuted; and the case is the worse if princes be the persecutors, for they have not only the sword in their hand, and therefore can do the more hurt, but they have the law on their side, and can do it with reputation and a colour of justice. It is sad that the power which magistrates have from God, and should use for him, should ever be employed against him. But marvel not at the matter, Ecc 5:8. It was a comfort to David that when princes persecuted him he could truly say it was without cause, he never gave them any provocation. 2. How he was kept to his duty, notwithstanding, by the fear of God: "They would make me stand in awe of them and their word, and do as they bid me; but my heart stands in awe of thy word, and I am resolved to please God, and keep in with him, whoever is displeased and falls out with me." Every gracious soul stands in awe of the word of God, of the authority of its precepts and the terror of its threatenings; and to those that do so nothing appears, in the power and wrath of man, at all formidable. We ought to obey God rather than men, and to make sure of God's favour, though we throw ourselves under the frowns of all the world, Luk 12:4, Luk 12:5. The heart that stands in awe of God's word is armed against the temptations that arise from persecution.

Lord, I have hoped for thy salvation,.... Either temporal salvation and deliverance from enemies, and from afflictions, which God had promised, and therefore he had reason to hope for; or spiritual and eternal salvation, resolved on in the mind of God, provided in covenant, promised to be wrought out by Christ, and which since has been accomplished; and therefore there is a sufficient foundation to hope for it;

and done thy commandments: this was not the cause, ground, and foundation of his hope; for then it would not have been like an anchor, sure and steadfast, but as the hope of the hypocrite, which is as the spider's web; but this was the effect of his hope; because he had a good hope of salvation, therefore he was studiously concerned to do the commandments of God; his hope prompted him to it, and encouraged him in it; see Jo1 3:2. Kimchi's note here is a good one; "and done thy commandments", not for hope of reward; but I have done them as thy commandments are with me and I know that I shall have salvation, and I have hoped for it.