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 main thing needed to make men happy is intelligence.

If any philosopher had been asked for a definition of infinity, he might have produced some unintelligible rigmarole, but he would certainly not have been able to give a definition that had any meaning at all.

A smile happens in a flash, but its memory can last a lifetime.

The more intense has been the religion of any period and the more profound has been the dogmatic belief, the greater has been the cruelty and the worse has been the state of affairs.

Both in thought and in feeling, even though time be real, to realise the unimportance of time is the gate of wisdom.

To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.