Someone might object: 'But a rational person should understand what they're doing.' They say it's natural for social beings to be aware of their good deeds. They want the person they help to notice too. What you say is true, but you miss the real point. You're one of those people I mentioned before. You're fooled by something that only seems reasonable. If you truly want to understand what I'm saying, don't worry. You won't stop doing good for others.
'Nay but,' will some reply perchance, 'this very thing a rational man is bound unto, to understand what it is, that he doeth.' For it is the property, say they, of one that is naturally sociable, to be sensible, that he doth operate sociably: nay, and to desire, that the party him self that is sociably dealt with, should be sensible of it too. I answer, That which thou sayest is true indeed, but the true meaning of that which is said, thou dost not understand. And therefore art thou one of those first, whom I mentioned. For they also are led by a probable appearance of reason. But if thou dost desire to understand truly what it is that is said, fear not that thou shalt therefore give over any sociable action.