101 And so since he was separated from his parents through piety not on account of impiety, he talked with God, he increased in riches, in children, and in favour. Nor was he elated by these things when he met his brother; but humbly bowed down to him, not indeed considering him the pitiless, the furious, the degenerate, but Him Whom he reverenced in him. And so he bowed down seven times, which is the number of remission, for he was not bowing down to man, but to Him Whom he foresaw in the Spirit, as hereafter to come in human flesh to take away the sins of the world. And this mystery is unfolded to you in the answer given to Peter, when he said: “If my brother trespass against me how often shall I forgive him? Until seven times?” You see that remission of sins is a type of that great Sabbath, of that rest of everlasting grace, and therefore is given by contemplation.
Source: Letters (New Advent)