To deny me the right to err is therefore to deny me the right to believe.

The difference between science and religion is that the former wishes to get rid of mysteries whereas the latter worships them.

The easiest rationalization for the refusal to seek the truth is the denial that truth exists.

[A]nti-Semitism was rife in almost all varieties of socialism.

No one who accepts the sovereignty of truth can be a foot soldier in a party or movement. He will always find himself out of step.

Everyone who remembers his own education remembers teachers, not methods and techniques. The teacher is the heart of the educational system.

To silence criticism is to silence freedom.