The most evident difference between man and animals is this: the beast, in as much as it is largely motivated by the senses and with little perception of the past or future, lives only for the present. But man, because he is endowed with reason by which he is able to perceive relationships, sees the causes of things, understands the reciprocal nature of cause and effect, makes analogies, easily surveys the whole course of his life, and makes the necessary preparations for its conduct.
It is graceful in a man to think and to speak with propriety, to act with deliberation, and in every occurrence of life to find out and persevere in the truth. On the other hand, to be imposed upon, to mistake, to falter, and to be deceived, is as ungraceful as to rave or to be insane.
The rule of friendship means there should be mutual sympathy between them, each supplying what the other lacks and trying to benefit the other, always using friendly and sincere words.
It is generally said, "Past labors are pleasant," Euripides says, for you all know the Greek verse, "The recollection of past labors is pleasant."
[Lat., Vulgo enim dicitur, Jucundi acti labores: nec male Euripides: concludam, si potero, Latine: Graecum enim hunc versum nostis omnes: Suavis laborum est proeteritorum memoria.