Book 3.2

Who is so ungrateful as he who has so completely laid aside and cast away that which ought to be in the forefront of his mind and ever before him, that he knows it not? It is clear that if forgetfulness of a benefit steals over a man, he cannot have often thought about repaying it.

In short, repayment requires gratitude, time, opportunity, and the help of fortune; whereas, he who remembers a benefit is grateful for it, and that too without expenditure. Since gratitude demands neither labour, wealth, nor good fortune, he who fails to render it has no excuse behind which to shelter himself; for he who places a benefit so far away that it is out of his sight, never could have meant to be grateful for it. Just as those tools which are kept in use, and are daily touched by the hand, are never in danger of growing rusty, while those which are not brought before our eyes, and lie as if superfluous, not being required for common use, collect dirt by the mere lapse of time, so likewise that which our thoughts frequently turn over and renew never passes from our memory, which only loses those things to which it seldom directs its eyes.