When an opinionated person starts to challenge something, his mind shuts out all that could clear up the matter. The argument irritates him, however just it might be, and it seems that he is afraid of discovering the truth.

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.

The ties of virtue ought to be closer than the ties of blood, since the good man is closer to another good man by their similarity of morals than the son is to his father by their similarity of face.

When High and Mighty people want to make us believe that they possess some good quality which they in fact do not have, it is dangerous to show that you doubt them; because, by removing their hope of deceiving the world, you also remove their desire to perform the good acts that might have arisen from their very pretensions.

Ignorance makes for weakness and fear; knowledge gives strength and confidence. Nothing surprises an intellect that knows all things with a sense of discrimination.

It is a very common failing, never to be pleased with our fortune nor displeased with our character.

There are people so blind and self-absorbed in all matters that they always believe that, whatever they desire or think, they can impose their will on other people. Whatever bad reason they use to persuade others, these self-centered people are so caught up in the process that it seems to them all they have to do is to speak their wishes in a lofty and commanding tone of voice in order to convince everybody.