I was very pleased with your kind letter. Until now I never dreamed of being something like a hero. But since you've given me the nomination I feel that I am one.

Don't second guess the mistakes you've made, others will do that for you. Make things as simple as possible, but not simpler.

Work is the only thing I do to escape the corruption of praise.

Intelligent life on other planets? I'm not even sure there is on earth!

The pioneers of a warless world are the young men (and women) who refuse military service.

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

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.