A science of all these possible kinds of space [the higher dimensional ones] would undoubtedly be the highest enterprise which a finite understanding could undertake in the field of geometry... If it is possible that there could be regions with other dimensions, it is very likely that God has somewhere brought them into being.

I assert that, in any particular natural science, one encounters genuine scientific substance only to the extent that mathematics is present.

Every human being should always be treated as an end and never as a mere instrument.

With men, the state of nature is not a state of peace, but war.

Do what is right, though the world may perish.

One who makes himself a worm cannot complain afterwards if people step on him.

Melancholy characterizes those with a superb sense of the sublime.