The germs of all things are in every heart, and the greatest criminals as well as the greatest heroes are but different modes of ourselves.

Common sense is calculation applied to life.

Doing easily what others find difficult is talent; doing what is impossible for talent is genius.

The ideal doctor would be a man endowed with profound knowledge of life and of the soul, intuitively divining any suffering or disorder of whatever kind, and restoring peace by his mere presence.

If man was what he ought to be, he would be adored by the animals.

Philosophy means the complete liberty of the mind, and therefore independence of all social, political or religious prejudice... It loves one thing only... truth.

The obscure only exists that it may cease to exist. In it lies the opportunity of all victory and all progress. Whether it call itself fatality, death, night, or matter, it is the pedestal of life, of light, of liberty and the spirit. For it represents resistance -- that is to say, the fulcrum of all activity, the occasion for its development and its triumph.