1. Genius can only breathe freely in an atmosphere of freedom.
2. A people may prefer a free government, but if, from indolence, or carelessness, or cowardice, or want of public spirit, they are unequal to the exertions necessary for preserving it.
3. No one can be a great thinker who does not recognize that as a thinker it is his first duty to follow his intellect to whatever conclusions it may lead.
4. To achieve their ends, bad people only need good people to stand by and do nothing.
5. I realized that in order to be happy, a person must choose some other end and then, as he attains it, he will feel rewarded on his own without thinking of the end sought.
6. With the imperfection of our reason, the interests of truth call for different opinions.
7. Ask yourself if you are happy and you’ll stop being happy.
8. It is better to be a human being dissatisfied than a pig satisfied; better to be Socrates dissatisfied than a fool satisfied.
9. Men do not desire to be rich, but to be richer than other men.
10. Outstanding abilities and deep studies are meaningless if from time to time they do not lead to conclusions different from those that could be obtained with ordinary abilities and without studies.