A man's life is what his thoughts make of it.

The memory of everything is very soon overwhelmed in time.

I have often wondered how it is that every man loves himself more than all the rest of men, but yet sets less value on his own opinions of himself than on the opinions of others.

...if a man comes to his fortieth year, and has any understanding at all, he has virtually seen - thanks to their similarity - all possible happenings, both past and to come.

A lucky chance is constant in nothing but inconstancy.

Always follow these two rules: first, act only on what your reasoning mind proposes for the good of humanity, and second, change your opinion if someone shows you it's wrong. This change of mind must proceed only from the conviction that it's both correct and for the common good, but not because it will give you pleasure and make you popular.

The true worth of a man is to be measured by the objects he pursues.