XVIII. But picture to yourself a man not only cunning, so as to be prepared to act dishonestly in any circumstances that may arise, but also exceedingly powerful; as, for instance, Marcus Crassus was, who, however, always exercised his own natural good disposition; or as at this day our friend Pompeius is, to whom we ought to feel grateful for his virtuous conduct; for, although he is inclined to act justly, he could be unjust with perfect impunity. But how many unjust actions can be committed which nevertheless no one could find any ground for attacking! Suppose your friend, when dying, has entreated you to restore his inheritance to his daughter, and yet has never set it down in his will, as Fadius did, and has never mentioned to any one that he has done so, what will you do? You indeed will restore it. Perhaps Epicurus himself would have restored it; just as Sextus Peducæus the son of Sextus did; he who has left behind him a son, our intimate friend, a living image of his own virtue and honesty, a learned person, and the most virtuous and upright of all men; for he, though no one was aware that he had been entreated by Caius Plotius, a Roman knight of high character and great fortune, of the district of Nursia, to do so, came of his own accord to his widow, and, though she had no notion of the fact, detailed to her the commission which he had received from her husband, and made over the inheritance to her. But I ask you (since you would certainly have acted in the same manner yourself), do you not understand that the power of nature is all the greater, inasmuch as you yourselves, who refer everything to your own advantage, and, as you yourselves say, to pleasure, still perform actions from which it is evident that you are guided not by pleasure, but by principles of duty, and that your own upright nature has more influence over you than any vicious reasoning? If you knew, says Carneades, that a snake was lying hid in any place, and that some one was going ignorantly to sit down upon it whose death would bring you some advantage, you would be acting wickedly if you did not warn him not to sit down there; and yet you could not be punished, for who could possibly convict you? However, I am dwelling too long on this point; for it is evident, unless equity, good faith and justice proceed from nature, and if all these things are referred to advantage, that a good man cannot possibly be found. But on this subject we have put a sufficient number of arguments into the mouth of Lælius, in our books on a Republic.