I already understand what you wish to ask; there is no need for you to say anything, your countenance speaks for you. “If anyone does us good for his own sake, are we,” you ask, “under an obligation to him? I often hear you complain that there are some things which men make use of themselves, but which they put down to the account of others.” I will tell you, my Liberalis; but first let me distinguish between the two parts of your question, and separate what is fair from what is unfair. It makes a great difference whether anyone bestows a benefit upon us for his own sake, or whether he does so partly for his own sake and partly for ours. He who looks only to his own interests, and who does us good because he cannot otherwise make a profit for himself, seems to me to be like the farmer who provides winter and summer fodder for his flocks, or like the man who feeds up the captives whom he has bought in order that they may fetch a better price in the slave market, or who crams and currycombs fat oxen for sale; or like the keeper of a school of arms, who takes great pains in exercising and equipping his gladiators. As Cleanthes says, there is a great difference between benefits and trade.