The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.

the autobiography is at one and the same time a single element in the series of the writer's created works and an interpretation of the whole series.

We ought to recognise the profound gulf between the work to which we are 'called' and the work we are forced into as a means of livelihood.

The young were always theoretical; only the middle-aged could realize the deadliness of principles.

People who prefer to believe the worst of others will breed war and religious persecutions while the world lasts.

the heaviest restriction upon the freedom of public opinion is not the official censorship of the Press, but the unofficial censorship by a Press which exists not so much to express opinion as to manufacture it.

[T]he more clamour we make about 'the women's point of view', the more we rub it into people that the women's point of view is different, and frankly I do not think it is -- at least in my job. The line I always want to take is, that there is the 'point of view' of the reasonably enlightened human brain, and that this is the aspect of the matter which I am best fitted to uphold.