The psalmist here in a most affectionate manner, like an Israelite indeed, resolves to stick to the word of God and to live and die by it.
I. He resolves to portion himself in it, and there to seek his happiness, nay, there to enjoy it; "Thy testimonies (the truths, the promises, of thy word) have I taken as a heritage for ever, for they are the rejoicing of my heart." The present delight he took in them was an evidence that the good things contained in them were in his account the best things, and the treasure which he set his heart upon. 1. He expected an eternal happiness in God's testimonies. The covenant God had made with him was an everlasting covenant, and therefore he took it as a heritage for ever. If he could not yet say, "They are my heritage," yet he could say, "I have made choice of them for my heritage; and will never take up with a portion in this life," Psa 17:14, Psa 17:15. God's testimonies are a heritage to all that have received the Spirit of adoption; for, if children, then heirs. They are a heritage for ever, and that no earthly heritage is (Pe1 1:4); all the saints accept them as such, take up with them, live upon them, and can therefore be content with but little of this world. 2. He enjoyed a present satisfaction in them: They are the rejoicing of my heart, because they will be my heritage for ever. It requires the heart of a good man to see his portion in the promise of God and not in the possessions of this world.
II. He resolves to govern himself by it and thence to take his measures: I have inclined my heart to do thy statutes. Those that would have the blessings of God's testimonies must come under the bonds of his statutes. We must look for comfort only in the way of duty, and that duty must be done, 1. With full consent and complacency: "I have, by the grace of God, inclined my heart to it, and conquered the aversion I had to it." A good man brings his heart to his work and then it is done well. A gracious disposition to do the will of God is the acceptable principle of all obedience. 2. With constancy and perseverance. He would perform God's statutes always, in all instances, in the duty of every day, in a constant course of holy walking, and this to the end, without weariness. This is following the Lord fully.

Uphold me according unto thy word,.... In thy ways, that my footsteps slip not; in thine arms, and with the right hand of thy righteousness, from fainting and sinking under difficulties and discouragements, in trying circumstances; and from slipping and sliding out of the way of God; and from a total and final filling away, according to thy word of promise, that, as are the days of thy people, their strength shall be; and that thou wilt never leave them nor forsake them. The Targum is,

"uphold me in thy word;''

or by thy word, either essential or written;

that I may live; meaning not corporeally, though none so live but whom the Lord upholds in life; but, spiritually, live by faith on Christ the Saviour, live comfortably on the word of promise, and live honourably, agreeably to the word of God, in all holy conversation and godliness;

and let me not be ashamed of my hope: as men are, when they are disappointed or having and enjoying what they have been hoping and waiting for; but the grace of hope makes not ashamed, nor shall those who have it ever have any reason to be ashamed of it; since it is a good hope through grace; is an anchor of the soul, sure and steadfast; is upon a good foundation, Christ, and by which men are saved; and so may rejoice, in full hope of the glory of God they shall certainly enjoy.