On Benefits Book II, XXIII

There are some, who only like to receive benefits privately: they dislike having any witnesses and confidants.

Such men, we may believe, have no good intentions.

As a giver is justified in dwelling upon those qualities of his gift which will please the receiver, so a man, when he receives, should do so publicly; you should not take from a man what you are ashamed to owe him. Some return thanks to one stealthily, in a corner, in a whisper.

This is not modesty, but a kind of denying of the debt: it is the part of an ungrateful man not to express his gratitude before witnesses.

Some object to any accounts being kept between them and their benefactors, and wish no brokers to be employed or witnesses to be called, but merely to give their own signature to a receipt.

Those men do the like, who take care to let as few persons as possible know of the benefits which they have received.

They fear to receive them in public, in order that their success may be attributed rather to their own talents than to the help of others: they are very seldom to be found in attendance upon those to whom they owe their lives and their fortunes, and thus, while avoiding the imputation of servility, they incur that of ingratitude.