But you know, Lord, that I preferred to have honest pupils, in so far as honesty has any meaning nowadays, and I had no evil intent when I taught the tricks of pleading, for I never meant them to be used to get the innocent condemned but, if the occasion arose, to save the lives of the guilty. From a distance, my God, you saw me losing my foothold on this treacherous ground, but through clouds of smoke you also saw a spark of good faith in me; for though, as I schooled my pupils, I was merely abetting their futile designs and their schemes of duplicity, nevertheless I did my best to teach them honestly.
In those days I lived with a woman, not my lawful wedded wife but a mistress whom I had chosen for no special reason but that my restless passions had alighted on her. But she was the only one and I was faithful to her. Living with her I found out by my own experience the difference between the restraint of the marriage alliance, contracted for the purpose of having children, and a bargain struck for lust, in which the birth of children is begrudged, though if they come, we cannot help but love them.
Augustine, Confessions, IV.2. (emphasis mine)
It is amazing how relevant the ancients are, provided only we read them.