The dog knows, but does not know that he knows.

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.

It often happens that what stares us in the face is the most difficult to perceive.

That there is an evolution of one sort or another is now common ground among scientists. Whether or not that evolution is directed is another question.

Is evolution a theory, a system, or a hypothesis? It is much more it is a general postulate to which all theories, all hypotheses, all systems must henceforward bow and which they must satisfy in order to be thinkable and true. Evolution is a light which illuminates all facts, a trajectory which all lines of thought must follow this is what evolution is.

The truth is, indeed, that love is the threshold of another universe.

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