In and after 1964 when I began to concern myself with the biological issues, and particularly from 1967 onwards, the extent of the problems over which I felt uneasy increased to such a point that in 1968 I felt a compelling urge to make my views public.

Intellectual freedom is the only guarantee of a scientific - democratic approach to politics, economic development, and culture.

You can't sit on two chairs at once.

In 1947 I defended my thesis on nuclear physics, and in 1948 I was included in a group of research scientists whose task was to develop nuclear weapons.

I could not stop something I knew was wrong and terrible. I had an awful sense of powerlessness.

Both now and for always, I intend to hold fast to my belief in the hidden strength of the human spirit.

Do not trust governments more than governments trust their own people.