He who uses trickery should at least make use of his judgment to learn that he can scarcely hide treacherous conduct for very long among clever men who are determined to find him out, although they may pretend to be deceived in order to disguise their knowledge of his deceitfulness.

Often our good deeds make enemies for us, and the ungrateful person despises us on two counts; for he is not only unwilling to acknowledge the gratitude he owes us: he does not want to have his benefactor as witness to his thankless behavior.

Although most friendships that exist do not merit the name, we can nevertheless make use of them in accordance with our needs, as a kind of commercial venture based on uncertain foundations and in which we are very often deceived.

Self-love makes us deceive ourselves in almost all matters, to censure others, and to blame them for the same faults that we do not correct in ourselves; we do this either because we are unaware of the evil that exists within us, or because we always see our own evil disguised as a good.

True merit does not depend on the times or on fashion. Those who have no other advantage than courtly manners lose it when they are away from court. But good sense, knowledge, and wisdom make their possessors knowledgeable and beloved in all ages and in all times.

Criticism should awaken our attention, not inflame our anger. We should listen to, and not flee from, those who contradict us. Truth should be our cause, no matter in what manner it comes to us.

It is an admirable skill to able to sweeten a refusal with civil words which atone for the favor which we are not able to grant.