The least movement is of importance to all nature. The entire ocean is affected by a pebble.

What part of us feels pleasure? Is it our hand, our arm, our flesh, or our blood? It must obviously be something immaterial.

Any unity which doesn't have its origin in the multitudes is tyranny.

The secrets of nature are concealed; her agency is perpetual, but we do not always discover its effects; time reveals them from age to age; and although she is always the same in herself, she is not always equally well known.

I can readily conceive of a man without hands or feet; and I could conceive of him without a head, if experience had not taught me that by this he thinks, Thought then, is the essence of man, and without this we cannot conceive of him.

Words differently arranged have a different meaning, and meanings differently arranged have different effects.

Education produces natural intuitions, and natural intuitions are erased by education.