Psalms 119:71

"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.