"No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable."

"I am wiser than this man, for neither of us appears to know anything great and good; but he fancies he knows something, although he knows nothing; whereas I, as I do not know anything, do not fancy I …"

"I have gained nothing by not living quietly, and I have not gained anything that is worthy of the name of gain."

"The greatest way to live with honour in this world is to be what we pretend to be."

"Wonder is the beginning of wisdom."