In the search for truth - that everything in nature seems to hide - man needs the assistance of all his faculties. All the senses should be awake.

The meanest hut with love in it is a palace fit for the gods, and a palace without love is a den only fit for wild beasts.

He who dishonors himself [by lying about his opinions] for the sake of being honored by others will find that two mistakes have been made - one by himself, and the other, by the people.

The real searcher after truth will not receive the old because it is old, or reject the new because it is new. He will not believe men because they are dead, or contradict them because they are alive. With him an utterance is worth the truth, the reason it contains, without the slightest regard to the author. He may have been a king or serf - a philosopher or servant, - but the utterance neither gains nor loses in truth or reason. Its value is absolutely independent of the fame or station of the man who gave it to the world.

The first step is for man to cease to be the slave of man. The second, is to cease to be the slave of the monsters of his own creation, the ghosts and phantoms of the air.

If we admit that some infinite being has controlled the destinies of persons and peoples, history becomes a most cruel and bloody farce.

There can be but little liberty on earth while men worship a tyrant in heaven.