O God, thou knowest my foolishness - The errors and follies of my life. Though conscious of innocence in this case - though he felt that his enemies hated him "without cause," and that they took what belonged to him and not to them, yet he was not insensible to the fact that he was a sinner, and he was not unwilling to confess before God, that, however conscious of uprightness he might be in his dealings toward people, yet toward God, he was a sinful man. From him he deserved all that had come upon him. Indeed the very calamities which had been permitted to come upon him were proof to his own mind that he was a sinner, and served, as they were doubtless designed, to turn his mind to that fact, and to humble him. The effect of calamities coming upon us, as reminding us of the fact that we are sinners, is often referred to in the Psalms. See Psalm 38:2-4; Psalm 40:12.

And my sins are not hid from thee - Margin, "guiltiness." The word used here has always attached to it the idea of "guilt." The meaning is, that God knew all his life; and that however unjust the conduct of "men" toward him might be when they treated him as if he had wronged them, yet considered as a part of the dealings of God, or as having been suffered to come upon him from God, all that had occurred was right, for it was a proper expression of the divine displeasure against his sins. We may feel that we have not wronged our fellow-men; yet even the treatment which we receive from them, however unjust so far as they are concerned, may be regarded as deserved by us at the hand of God, and as proper on his part as an expression of his displeasure for our transgressions against him, and as a proof that we are sinners. Trial never comes to us from any quarter except as founded on the fact that we are sinners; and even where there is entire innocence toward our fellow-men, God may make use of their passions to rebuke and discipline us for our sins toward himself.

Psalm 69:5 Parallel Commentaries

The Golden Calf
'And when the people saw that Moses delayed to come down out of the mount, the people gathered themselves together unto Aaron, and said unto him, Up, make us gods, which shall go before us; for as for this Moses, the man that brought us up out of the land of Egypt, we wot not what is become of him. 2. And Aaron said unto them, Break off the golden earrings, which are in the ears of your wives, of your sons, and of your daughters, and bring them unto me. 3. And all the people brake off the golden …
Alexander Maclaren—Expositions of Holy Scripture

The Johannine Writings
BY the Johannine writings are meant the Apocalypse and the fourth gospel, as well as the three catholic epistles to which the name of John is traditionally attached. It is not possible to enter here into a review of the critical questions connected with them, and especially into the question of their authorship. The most recent criticism, while it seems to bring the traditional authorship into greater uncertainty, approaches more nearly than was once common to the position of tradition in another …
James Denney—The Death of Christ

Of the Lord's Supper, and the Benefits Conferred by It.
1. Why the Holy Supper was instituted by Christ. The knowledge of the sacrament, how necessary. The signs used. Why there are no others appointed. 2. The manifold uses and advantages of this sacrament to the pious. 3. The Lord's Supper exhibits the great blessings of redemption, and even Christ himself. This even evident from the words of the institution. The thing specially to be considered in them. Congruity of the signs and the things signified. 4. The chief parts of this sacrament. 5. How Christ, …
John Calvin—The Institutes of the Christian Religion