[4] Therefore animals and plants, after considerable intervals and interruptions, bring forth their appropriate fruits, once, or at most twice a year; according to the number of times which nature has appointed each of them, and which is properly adapted to the seasons of the year. But virtue without any interruption, without any interval or any cessation, is continually bringing forth at all times and on all occasions, not indeed children, but virtuous reasonings, and irreproachable counsels, and praiseworthy actions.