As a Roman philosopher, Cicero, said of him a few hundred years later, Socrates 'called philosophy down from the sky and established her in the towns and introduced her into homes and forced her to investigate life, ethics, good and evil.

There is no order of things except in the human mind.

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.

Life is short for those who are truly able to understand that one day the entire world will come to a complete end. Not everyone is capable of that. Not everyone has the ability to comprehend what going away for all eternity really implies. There are too many distractions, hour by hour, minute by minute, to hinder such an understanding.

...long before the child learns to talk properly-and long before it learns to think philosophically-the world will have become a habit. A pity, if you ask me.

There are five billion people living on this planet. But you fall in love with one particular person, and you won't swap her for any other.

A hydrogen atom in a cell at the end of my nose was once part of an elephant's trunk. A carbon atom in my cardiac muscle was once in the tail of a dinosaur.