Psalms 119:71

Sin abounded by the law because through the law came knowledge of sin, and it became harmful for me to know what through my weakness I could not avoid. It is good to know beforehand what one is to avoid, but, if I cannot avoid something, it is harmful to have known about it. Thus was the law changed to its opposite, yet it became useful to me by the very increase of sin, for I was humbled. And David therefore says, "It is good for me that I have been humbled." By humbling myself I have broken the bonds of that ancient transgression by which Adam and Eve had bound the whole line of their succession. Hence, too, the Lord came as an obedient man to loose the knot of human disobedience and deception. And as through disobedience sin entered, so through obedience sin was remitted. Therefore, the apostle says, "For just as by the disobedience of one man the many were constituted sinners, so also by the obedience of the one the many will be constituted just."

"It is good for me that You have humbled me: that I might learn Your righteousnesses" [Psalm 119:71]. He has said something kindred to this above. For by the fruit itself he shows that it was a good thing for him to be humbled; but in the former passage he has stated the cause also, in that he had felt beforehand that humiliation which resulted from his punishment, when he went wrong. But in these words, "Wherefore have I kept Your word:" and again in these, "That I might learn Your righteousnesses:" he seems to me to have signified, that to know these is the same thing as to keep them, to keep them the same thing as to know them. For Christ knew what He reproved; and yet He reproved sin, though it is said of Him that "He knew not sin." [2 Corinthians 5:21] He knew therefore by a kind of knowledge, and again He knew not by a kind of ignorance. Thus also many learn the righteousnesses of God, and learn them not. For they know them in a certain way; and, again do not know them from a kind of ignorance, since they do them not. In this sense the Psalmist therefore is to be understood to have said, "That I might learn Your righteousnesses," meaning that kind of knowledge whereby they are performed.