You can never know if a person forgives you when you wrong them. Therefore it is existentially important to you. It is a question you are intensely concerned with. Neither can you know whether a person loves you. It’s something you just have to believe or hope. But these things are more important to you than the fact that the sum of the angles in a triangle is 180 degrees. You don't think about the law of cause and effect or about modes of perception when you are in the middle of your first kiss.

All beauty that surrounds us must one day perish.

As long as we are children, we have the ability to experience things around us--but then we grow used to the world. To grow up is to get drunk on sensory experience.

The soul yearns to fly home on the wings of love to the world of ideas. It longs to be freed from the chains of the body.

People are, generally speaking, either dead certain or totally indifferent.

Over the entrance to the temple at Delphi was a famous inscription: KNOW THYSELF! It reminded visitors that man must never believe himself to be more than mortal - and that no man can escape his destiny.

Then you have a big problem, because a human is a thinking animal. If you don't think, you're not really a human.