Three things tell a man: his eyes, his friends and his favorite quotes

In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so.

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.

Act only according to that maxim whereby you can at the same time will that it should become a universal law.

Ingratitude is the essence of vileness.

I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.

In every department of physical science there is only so much science, properly so-called, as there is mathematics.