The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice.

Science does not aim at establishing immutable truths and eternal dogmas; its aim is to approach the truth by successive approximations, without claiming that at any stage final and complete accuracy has been achieved.

Among the Tibetans, one wife has many husbands, because men are too poor to support a whole wife.

Belief in a Divine mission is one of the many forms of certainty that have afflicted the human race.

Teachers are more than any other group the guardians of civilization.

Any pleasure that does no harm to other people is to be valued.

Marriage is for women the commonest mode of livelihood, and the total amount of undesired sex endured by women is probably greater in marriage than in prostitution.