If we take science as our sole guide, if we accept and hold fast that alone which is verifiable, the old theology must go.

Were there no contrariety of interests, nothing would be more simple and easy than to form and preserve free institutions. The right of suffrage alone would be a sufficient guarantee. It is the conflict of opposing interests which renders it the most difficult work of man.

Birds and animals probably think without knowing that they think; that is, they have not self-consciousness. Only man seems to be endowed with this faculty; he alone develops disinterested intelligence, intelligence that is not primarily concerned with his own safety and well-being but that looks abroad upon things.

Alone Quotes