In knowledge of human affairs, we should never allow our minds to be enslaved by others by subjecting ourselves to their whims. We must maintain freedom of thought, and never accept anything of purely human authority into our heads. When we are presented with a diversity of opinions, we must choose, if we can; if we cannot, we must remain in doubt.

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.

We nearly always make ourselves masters of those whom we know well, because he who is thoroughly understood is in some sense subject to those who understand him.

In knowledge of human affairs, we should never allow our minds to be enslaved by others by subjecting ourselves to their whims. We must maintain freedom of thought, and never accept anything of purely human authority into our heads. When we are presented with a diversity of opinions, we must choose, if we can; if we cannot, we must remain in doubt.

Study and research into truth often only serves to make us see by experience our natural ignorance.

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.

There is nothing that does not have something perfect in it; and it is the happiness of good taste to be able to find this perfection in all things. But there is a natural malignity that often discovers a vice in the midst of several virtues, in order to reveal and proclaim the discovery to all the world - a quality that is more the mark of a naturally evil temperament than a superior sense of discrimination. And it is truly an evil lot, to pass one's life always feeding off the imperfections of others.