I feel worried, deeply worried, only about one thing - the possibility that we fall... that we cannot avoid an atomic war.
You have to stop to change direction.
Man is the only animal for whom his own existence is a problem which he has to solve.
One cannot be deeply responsive to the world without being saddened very often.
For [Karl] Marx it is socialist society which realizes "concretely" the religious principles of equality, brotherly love, and freedom.
The aim of life is to be fully born, though its tragedy is that most of us die before we are thus born.