There is a certain manner of self-absorption in speaking that always renders the speaker disagreeable. For it is as great a folly to listen only to ourselves while we are carrying on a conversation with others as it is to talk to ourselves while we are alone.

Self-love is almost always the ruling principle of our friendships. It makes us avoid all our obligations in unprofitable situations, and even causes us to forget our hostility towards our enemies when they become powerful enough to help us achieve fame or fortune.

We think highly of men when we do not know the extent of their capabilities, for we always suppose that more exists when we only see half.

We judge matters so superficially that ordinary acts and words, done and spoken with some flair and some knowledge of worldly matters, often succeed better than the greatest cleverness.

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.

Social intercourse, even friendship among most people, is a merely a business arrangement that lasts only so long as there is need.

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.