The discovery of nuclear reactions need not bring about the destruction of mankind any more than the discovery of matches.
Stupidity is a personal achievement which transcends national boundaries.
Politics is more difficult than physics.
Each act is an island in time, to be judged on its own.
Striving for peace and preparing for war are incompatible with each other, and in our time more so than ever.
Joy and amazement of the beauty and grandeur of this world of which man can just form a faint notion.