It is human self-renunciation when a man denies himself and the world opens up to him. But it is Christian self-renunciation when he denies himself and, because the world precisely for this shuts itself up to him, he must as one thrust out by the world seek God's confidence. The double-danger lies precisely in meeting opposition there where he had expected to find support, and he has to turn about twice; whereas the merely human self-resignation turns once.

Purity of heart is to will one thing.

Irony is a disciplinarian feared only by those who do not know it, but cherished by those who do. He who does not understand irony and has no ear for its whispering lacks of what might called the absolute beginning of the personal life. He lacks what at moments is indispensable for the personal life, lacks both the regeneration and rejuvenation, the cleaning baptism of irony that redeems the soul from having its life in finitude though living boldly and energetically in finitude.

To be a teacher does not mean simply to affirm that such a thing is so, or to deliver a lecture, etc.

Every day I walk myself into a state of well-being and walk away from every illness; I have walked myself into my best thoughts.

...the reason for [this age's] anxiety and unrest is because in one direction, 'truth' increases in scope and quantity - via science and technology - while in the other, certainty and confidence steadily decline. Our age is a master in developing truths while being wholly indifferent to certitude. It lacks confidence in the good.

I have, I believe, the courage to doubt everything; I have, I believe, the courage to fight against everything; but I do not have the courage to acknowledge anything, the courage to possess, to own anything.