One man, when he has done a service to another, is ready to set it down to his account as a favour conferred. Another is not ready to do this, but still in his own mind he thinks of the man as his debtor, and he knows what he has done. A third in a manner does not even know what he has done, but he is like a vine which has produced grapes, and seeks for nothing more after it has once produced its proper fruit. As a horse when he has run, a dog when he has tracked the game, a bee when it has made the honey, so a man when he has done a good act, does not call out for others to come and see, but he goes on to another act, as a vine goes on to produce again the grapes in season.- Must a man then be one of these, who in a manner act thus without observing it?- Yes.- But this very thing is necessary, the observation of what a man is doing: for, it may be said, it is characteristic of the social animal to perceive that he is working in a social manner, and indeed to wish that his social partner also should perceive it.- It is true what thou sayest, but thou dost not rightly understand what is now said: and for this reason thou wilt become one of those of whom I spoke before, for even they are misled by a certain show of reason. But if thou wilt choose to understand the meaning of what is said, do not fear that for this reason thou wilt omit any social act.
Everything exists for some end, a horse, a vine. Why dost thou wonder? Even the sun will say, I am for some purpose, and the rest of the gods will say the same. For what purpose then art thou? to enjoy pleasure? See if common sense allows this.
Nothing can happen to any man which is not a human accident, nor to an ox which is not according to the nature of an ox, nor to a vine which is not according to the nature of a vine, nor to a stone which is not proper to a stone. If then there happens to each thing both what is usual and natural, why shouldst thou complain? For the common nature brings nothing which may not be borne by thee.