We are not human beings having a spiritual experience. We are spiritual beings having a human experience.

Someday, after mastering the winds, the waves, the tides and gravity, we shall harness for God the energies of love, and then, for a second time in the history of the world, man will have discovered fire.

The world is round so that friendship may encircle it.

Growing old is like being increasingly penalized for a crime you haven't committed.

It is our duty as men and women to proceed as though the limits of our abilities do not exist.

The most satisfying thing in life is to have been able to give a large part of one's self to others.

Love is a sacred reserve of energy; it is like the blood of spiritual evolution.

I owe the best of myself to geology, but everything it has taught me tends to turn me away from dead things.

Love alone is capable of uniting living beings in such a way as to complete and fulfill them, for it alone takes them and joins them by what is deepest in themselves.