Two prisoners whose cells adjoin communicate with each other by knocking on the wall. The wall is the thing which separates them but is also their means of communication. It is the same with us and God. Every separation is a link.

He who has not God in himself cannot feel His absence.

I suffer more from the humiliations inflicted by my country than from those inflicted on her.

Every time that I think of the crucifixion of Christ, I commit the sin of envy.

Friendship is a miracle by which a person consents to view from a certain distance, without coming any nearer, the very being who is as necessary to him as food.

All the tragedies which we can imagine return in the end to the one and only tragedy: the passage of time.

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.