Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.

No fairer destiny could be allotted to any physical theory than that it should of itself point out the way to the introduction of a more comprehensive theory, in which it lives on as a limiting case.

The more I learn, the more I realize I don't know.

Highly developed spirits often encounter resistance from mediocre minds.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

I can understand your aversion to the use of the term 'religion' to describe an emotional and psychological attitude which shows itself most clearly in Spinoza... I have not found a better expression than 'religious' for the trust in the rational nature of reality that is, at least to a certain extent, accessible to human reason.

It almost seems to me that man was not born to be a carnivore.