The word God is for me nothing more than the expression and product of human weaknesses.

You think you have troubles with mathematics . . . I assure you mine are still bigger.

I want to go when I want. It is tasteless to prolong life artificially. I have done my share, it is time to go. I will do it elegantly.

All such action would cease if those powerful elemental forces were to cease stirring within us.

It is the duty of every citizen according to his best capacities to give validity to his convictions in political affairs.

For the moral attitudes of a people that is supported by religion need always aim at preserving and promoting the sanity and vitality of the community and its individuals, since otherwise this community is bound to perish. A people that were to honour falsehood, defamation, fraud, and murder would be unable, indeed, to subsist for very long.

Relativity is a purely scientific matter and has nothing to do with religion.