Only in mathematics and physics was I, through self-study, far beyond the school curriculum, and also with regard to philosophy as it was taught in the school curriculum.

I am convinced that some political and social activities and practices of the Catholic organizations are detrimental and even dangerous for the community as a whole, here and everywhere. I mention here only the fight against birth control at a time when overpopulation in various countries has become a serious threat to the health of people and a grave obstacle to any attempt to organize peace on this planet.

One strength of the communist system of the East is that it has some of the character of a religion and inspires the emotions of a religion.

Insofar as we may at all claim that slavery has been abolished today, we owe its abolition to the practical consequences of science

Go out as far as you can go and start from there

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.

Almost all the other fellows do not look from the facts to the theory but from the theory to the facts; they cannot get out of the network of already accepted concepts; instead, comically, they only wriggle about inside.