Charles H. Spurgeon on Psalms 26:3

For thy lovingkindness is before mine eyes. An object of memory and a ground of hope. A sense of mercy received sets a fair prospect before the faithful mind in its gloomiest condition, for it yields visions of mercies yet to come, visions not visionary but real. Dwell, dear reader, upon that celestial word lovingkindness. It has a heavenly savour. Is it not an unmatchable word, unexcelled, unrivalled? The goodness of the Lord to us should be before our eyes as a motive actuating our conduct; we are not under the bondage of the law, but we are under the sweet constraints of grace, which are far more mighty, although far more gentle. Men sin with the law before their eyes, but divine love, when clearly seen, sanctifies the conversation. If we were not so forgetful of the way of mercy in which God walks toward us, we should be more careful to walk in the ways of obedience toward him. And I have walked in thy truth. The psalmist was preserved from sin by his assurance of the truthfulness of God's promise, which truth he endeavoured to imitate as well as to believe. Observe from this verse that an experience of divine love will show itself in a practical following of divine truth; those who neglect either the doctrinal or practical parts of truth must not wonder if they lose the experimental enjoyment of it. Some talk of truth, it is better to walk in it. Some vow to do well in future, but their resolutions come to nothing; only the regenerate man can say "I have walked in thy truth."

Verses 4-5. So far from being himself an open offender against the laws of God, the psalmist had not even associated with the lovers of evil. He had kept aloof from the men of Belial. A man is known by his company, and if we have kept ourselves apart from the wicked, it will always be evidence in our favour should our character be impugned. He who was never in the parish is not likely to have stolen the corn. He who never went to sea is clearly not the man who scuttled the ship.