[The aim of science is] to explain what so far has taken to be an explicans, such as a law of nature. The task of empirical science constantly renews itself. We may go on forever, proceeding to explanations of a higher and higher universality.

The moral decisions of others should be treated with respect, as long as such decisions do not conflict with the principle of tolerance.

The belief in a political Utopia is especially dangerous. This is possibly connected with the fact that the search for a better world, like the investigation of our environment, is (if I am correct) one of the oldest and most important of all the instincts.

I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or convention which logic one adopts. I disagree with this view.

Good tests kill flawed theories; we remain alive to guess again.

Genuine philosophical problems are always rooted outside philosophy and they die if these roots decay.

Science is perhaps the only human activity in which errors are systematically criticized and, in time, corrected.