We possess nothing in the world - a mere chance can strip us of everything - except the power to say 'I.

Just as the power of the sun is the only force in the natural universe that causes a plant to grow against gravity, so the grace of God is the only force in the spiritual universe that causes a person to grow against the gravity of their own ego.

One could count on one's fingers the number of scientists throughout the world with a general idea of the history and development of their particular science: there is none who is really competent as regards sciences other than his own. As science forms an indivisible whole, one may say that there are no longer, strictly speaking, scientists, but only drudges doing scientific work.

The needs of a human being are sacred. Their satisfaction cannot be subordinated either to reasons of state, or to any consideration of money, nationality, race, or color, or to the moral or other value attributed to the human being in question, or to any consideration whatsoever.

Someone who does not see a pane of glass is not aware of not seeing it.

I am not a Catholic; but I consider the Christian idea, which has its roots in Greek thought and in the course of the centuries has nourished all of our European civilization, as something that one cannot renounce without becoming degraded.

Man alone can enslave man.