I have kept thy commandments and thy testimonies. What the Psalmist had expressed more strongly, he now repeats more simply, adding there to reason. He abbreviates the statement as made in the preceding verse only by here omitting the word soul, which he there uses, whilst to commandments he joins testimonies, in order the more distinctly to show that he does not speak exclusively of the rule of an upright and holy life, but also comprehends the whole covenant of salvation. And, assuredly, the doctrine of the law could not be so sweet and attractive from its commanding what is right, did it not at the same time exhibit the free favor of God. The reason which the Prophet assigns for his keeping God's commandments and testimonies -- for all my ways are before thee [1] -- is to this effect, That the truth, which he well knew, that nothing is hidden from God, served as a bridle to keep him devoted to the cultivation of godliness; for if we live not as under the omniscient inspection of God, the fickle lustfulness of the flesh quickly carries us away now one way and now another. The meaning, also, may be this -- that he made God the arbiter and judge of his life; for in Scripture language those are said to walk before God, who refer all their actions to him, and, as it were, withdrawing themselves from the sight of men, present themselves at his judgment-seat. In this way he gives us to understand that he had endeavored not only to be free from all fault and blame before men, but also to offer to God a sound and sincere heart. Whichever of these senses is adopted, he testifies that it is only when we consider that we have to deal with God, who searcheth the heart, and from whose eyes nothing is hidden, that we will observe his law aright. This concluding clause may also be a form of protestation; as if the Prophet had said, Lord, thou art the best witness of the fidelity with which I have kept thy law, for nothing is hidden from thee. But he seems rather to have intended to intimate that the principle of his holy living, was his having consecrated his life to God, and having kept his thoughts fixed on the diverse presence.

Footnotes

1 - "All my ways are before thee" The meaning of this expression may be gathered from other scriptural phrases: such as walking before God;' or in his sight;' which merely signify to live holy and righteously, so as to be acceptable in his sight. God is omniscient, and, consequently, all the ways' or actions of men are before him,' or open to his knowledge and sight." -- Warner.

I have kept thy precepts and thy testimonies - This is an appeal which is several times made in the psalm; not with boasting, but as indicating the tenor and purpose of his life. Every man ought to be able to make such an appeal.
For all my ways are before thee - Thou hast seen my manner of life, and I may appeal to thee in proof that I have thus kept thy law. No one can lay claim to entire perfection, but there is many a man who, while conscious of much imperfection, and many shortcomings, can appeal to God for the truth of the statement that his great aim of life has been to keep his commandments.

For all my ways are before thee - Thou knowest that I do not lie; thy eye has been upon my heart and my conduct, and thou knowest that I have endeavored to walk before thee with a perfect heart.

I have kept thy precepts and thy testimonies: (e) for all my ways [are] before thee.
(e) I had no respect for men, but set you always before my eyes as the judge of my doings.

I have kept thy precepts and thy testimonies,.... Both the preceptive and doctrinal part of the word, he preserved and observed both; this is repeated for the certainty of it, and to show his great affection to them;
for all my ways are before thee; this is either an appeal to God for the truth of what he had said, who saw and knew all the ways in which he walked, and which he had endeavoured should be conformable to the word of God; or it is a reason why he kept the precepts and testimonies of the Lord, because he knew his eyes were upon him; the omniscience of God had an influence over him, and caused him to be more attentive to the word, as the rule of his actions; see Psalm 139:1.

all my ways are before thee--I wish to order my ways as before Thee, rather than in reference to man (Genesis 19:1; Psalm 73:23). All men's ways are under God's eye (Proverbs 5:21); the godly alone realize the fact, and live accordingly.