Symmetry is what we see at a glance; based on the fact that there is no reason for any difference.

All of our reasoning ends in surrender to feeling.

We know the truth not only through our reason but also through our heart. It is through the latter that we know first principles, and reason, which has nothing to do with it, tries in vain to refute them.

Muhammad established a religion by putting his enemies to death; Jesus Christ by commanding his followers to lay down their lives.

Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.

When I consider the small span of my life absorbed in the eternity of all time, or the small part of space which I can touch or see engulfed by the infinite immensity of spaces that I know not and that know me not, I am frightened and astonished to see myself here instead of there … now instead of then.

The more intelligent a man is, the more originality he discovers in others.