| Quote | Philosopher | Lifespan |
| If God did not exist, it would be necessary to invent Him. | |
| Man was born free, and everywhere he is in chains. | |
| Happiness is not an ideal of reason but of imagination. | |
| Even while they teach, men learn. | |
| Hold faithfulness and sincerity as first principles. | |
| Knowledge is power. | |
| The state is not 'abolished,' it withers away. | |
| What experience and history teach us is this -- that people and governments have never learned anything from history, or acted on principles deduced from it. | |
| Suspicion is the companion of mean souls, and the bane of all good society. | |
| It is undesirable to believe a proposition when there is no ground whatever for supposing it true. | |
| I teach you the Superman. Man is something to be surpassed. | |
| | Quote | Philosopher | Lifespan |
| The greatest happiness of the greatest number is the foundation of morals and legislation. | |
| Man is by nature a political animal. | |
| The life which is unexamined is not worth living. | |
| God is not willing to do everything, and thus take away our free will and that share of glory which belongs to us. | |
| Liberty consists of doing what one desires. | |
| The class struggle necessarily leads to the dictatorship of the proletariat. | |
| Nature is a mutual cloud, which is always and never the same. | |
| Cogito, ergo sum. | |
| No man's knowledge here can go beyond his experience. | |
| There is only one good, knowledge, and one evil, ignorance. | |
| The life of a man (in a state of nature) is solitary, poor, nasty, brutish, and short. | |
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