History is the only laboratory we have in which to test the consequences of thought.

If our previous analyses are correct, they all point to the same conclusion, that metaphysical adventures are doomed to fail when their authors substitute the fundamental concepts of any particular science for those of metaphysics.

Why are there organized beings? Why is there something rather than nothing? Here again, I fully understand a scientist who refuses to ask it. He is welcome to tell me that the question does not make sense. Scientifically speaking, it does not. Metaphysically speaking, however, it does. Science can account for many things in the world; it may some day account for all that which the world of phenomena actually is. But why anything at all is, or exists, science knows not, precisely because it cannot even ask the question.

Humans feel at home in a world of things, whose essences and laws it can grasp and define in terms of concepts; but shy and ill at ease in a world of existences, because to exist is an act, not a thing.

Radiance belongs to being considered precisely as beautiful: it is, in being, that which catches the eye, or the ear, or the mind, and makes us want to perceive it again

Faith comes to intelligence as a light that overflows it with joy and inspires it with a certitude that does away with question.

History is the only laboratory we have in which to test the consequences of thought.