I have not sought during my life to amass wealth and to adorn my body, but I have sought to adorn my soul with the jewels of wisdom, patience, and above all with a love of liberty.

The understanding of mathematics is necessary for a sound grasp of ethics.

I am confident that there truly is such a thing as living again, that the living spring from the dead, and that the souls of the dead are in existence.

There are beds and tables in the world - plenty of them, are there not? But there are only two ideas or forms of them - one the idea of a bed, the other of a table.

The greatest of all mysteries is the man himself.

I know what I do not know.

The more I learn, the less I realize I know.