Vanity is but the surface.

We sail within a vast sphere, ever drifting in uncertainty, driven from end to end.

I feel engulfed in the infinite immensity of spaces whereof I know nothing, and which know nothing of me, I am terrified The eternal silence of these infinite spaces alarms me.

The heart has its reasons which reason knows nothing of... We know the truth not only by the reason, but by the heart." - Blaise Pascal

I can readily conceive of a man without hands or feet; and I could conceive of him without a head, if experience had not taught me that by this he thinks, Thought then, is the essence of man, and without this we cannot conceive of him.

Let each of us examine his thoughts

The parts of the universe ... all are connected with each other in such a way that I think it to be impossible to understand any one without the whole.