The hell of human suffering, evil and oppression is paved with good intentions. The men who have most injured and oppressed humanity, who have most deeply sinned against it, were according to their standards and their conscience good men; what was bad in them, what wrought moral evil and cruelty, treason to truth and progress, was not at all in their intentions, in their purpose, in their personal character, but in their opinions.

Rational Evolution: (the Making of Humanity) (ed. 1930)