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

At the heart of science lies discovery which involves a change in worldview. Discovery in science is possible only in societies which accord their citizens the freedom to pursue the truth where it may lead and which therefore have respect for different paths to that truth.

In nation after nation, democracy has taken the place of autocracy.

The eye searches for shapes. It searches for a beginning, a middle, and an end.

Idealism is the highest form of reason.

Some dreamers demand that scientists only discover things that can be used for good.

[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.