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.

Christians ought to suspect that affliction is the very essence of creation. To be a created thing is not necessarily to be afflicted, but it is necessarily to be exposed to affliction. ... Affliction is the surest sign that God wishes to be loved by us; it is the most precious evidence of His tenderness.

He who does not realize to what extent shifting fortune and necessity hold in subjection every human spirit, cannot regard as fellow-creatures nor love as he loves himself those whom chance separated from him by an abyss. The variety of constraints pressing upon man give rise to the illusion of several distinct species that cannot communicate. Only he who has measured the dominion of force, and knows how not to respect it, is capable of love and justice.

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

To be always relevant, you have to say things which are eternal.

Nothing is less instructive than a machine.

The most important part of teaching is to teach what it is to know.