“One could say, with a little exaggeration, that the persona is that which in reality one is not, but which oneself as well as others think one is.”

“Loneliness does not come from having no people about one, but from being unable to communicate the things that seem important to oneself, or from holding certain views which others find inadmissible.”

“Space flights are merely an escape, a fleeing away from oneself, because it is easier to go to Mars or to the moon than it is to penetrate one's own being.”

“I deliberately and consciously give preference to a dramatic, mythological way of thinking and speaking, because this is not only more expressive but also more exact than an abstract scientific terminology, which is wont to toy with the notion that its theoretic formulations may one fine day be resolved into algebraic equations.”

“One of the most difficult tasks men can perform, however much others may despise it, is the invention of good games.”

“Nature has no use for the plea that one 'did not know'.”

“Freedom of will is the ability to do gladly that which I must do.”