[Intellectual courage is] the quality that allows one to believe in one's judgement in the face of disappointment and widespread skepticism. Intellectual courage is even rarer than physical courage.

A new sense of shared international responsibility is unmistakable in the voices of the United Nations and its agencies, and in the civil society of thousands of supra-national NGOs.

Authority in science exists to be questioned, since heresy is the spring from which new ideas flow.

Though we explore in a culturally-conditioned way, the reality we sketch is universal.

Idealism is the highest form of reason.

In education the appetite does indeed grow with eating. I have never known anyone to abandon study because they knew too much.

Reality is no less precious if it presents itself to someone else. All are discoverers, and if we disenfranchise any, all suffer.