I do not say think as I think, but think in my way. Fear no shadows, least of all in that great spectre of personal unhappiness which binds half the world to orthodoxy.

Freedom and order are not incompatible... truth is strength... free discussion is the very life of truth.

No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man.

The only freedom I care about is the freedom to do right the freedom to do wrong I am ready to part with on the cheapest terms to anyone who will take it of me.

Every great advance in natural knowledge has involved the absolute rejection of authority.

The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.

The great thing in the world is not so much to seek happiness as to earn peace and self-respect.

I protest that if some great Power would agree to make me always think what is true and do what is right, on condition of being turned into a sort of clock and would up every morning before I got out of bed, I should instantly close with the offer.

The great thing in the world is not so much to seek happiness as to earn peace and self-respect.

I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men.