Ideas and principles that do harm are as a rule, though not always, cloaks for evil passions.

Answering questions is a major part of sex education. Two rules cover the ground. First, always give a truthful answer to a question; secondly, regard sex knowledge as exactly like any other knowledge.

The first effect of emancipation from the Church was not to make men think rationally, but to open their minds to every sort of antique nonsense

Bolshevism is to be reckoned with Mohammedanism rather than with Christianity and Buddhism. Christianity and Buddhism are primarily personal religions, with mystical doctrines and a love of contemplation. Mohammedanism and Bolshevism are practical, social, unspiritual, concerned to win the empire of the world.

Is a man what he seems to the astronomer, a tiny lump of impure carbon and water crawling impotently on a small and unimportant planet? Or is he what he appears to Hamlet? Is he perhaps both as once?

...I am afraid that education is conceived more in terms of indoctrination by most school officials than in terms of enlightenment. My own belief is that education must be subversive if it is to be meaningful. By this I mean that it must challenge all the things we take for granted, examine all accepted assumptions, tamper with every sacred cow, and instill a desire to question and doubt. Without this the mere instruction to memorise data is empty. The attempt to enforce conventional mediocrity on the young is criminal.

Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.