Charles H. Spurgeon on Psalms 119:3

They also do no iniquity. That is, they make not a trade and common practice thereof. Slip they do, through the infirmity of the flesh, and subtlety of Satan, and the allurements of the world; but they do not ordinarily and customably go forward in unlawful and sinful courses. In that the Psalmist setteth down this as a part (and not the least part neither) of blessedness, that they work none iniquity, which walk in his ways:the doctrine to be learned here is this, that it is a marvellous great prerogative to be freed from the bondage of sin. Richard Greenham.