But not only medicine, engineering, and painting are arts; living itself is an art in fact, the most important and at the same time the most difficult and complex art to be practiced by man.

The whole life of the individual is nothing but the process of giving birth to himself; indeed, we should be fully born when we die.

Man's main task in life is to give birth to himself, to become what he potentially is. The most important product of his effort is his own personality. One can judge objectively to what extent a person has succeeded in his task, to what degree he has realized his potentialities. If he has failed in his task, one can recognize this failure and judge it for what it is - a moral failure.

Giving is the highest expression of potency.

We are terribly imaginative, as far as technique in science is concerned. As far as changes in social arrangements are concerned, we lack utterly in imagination.

We have a religious renaissance today in America, as many people say. I would say this religious renaissance, ninety percent of it is the greatest danger true religious experience has ever been confronted with.

For [Karl] Marx it is socialist society which realizes "concretely" the religious principles of equality, brotherly love, and freedom.