“It is a great thing to know your vices.”

“It is not by muscle, speed, or physical dexterity that great things are achieved, but by reflection, force of character, and judgment.”

“Your enemies can kill you, but only your friends can hurt you.”

“I am not ashamed to confess I am ignorant of what I do not know.”

“Six mistakes mankind keeps making century after century:Believing that personal gain is made by crushing others;Worrying about things that cannot be changed or corrected;Insisting that a thing is impossible because we cannot accomplish it;Refusing to set aside trivial preferences;Neglecting development and refinement of the mind;Attempting to compel others to believe and live as we do.”

“Not to know what has been transacted in former times is to be always a child. If no use is made of the labours of past ages, the world must remain always in the infancy of knowledge.”

“Hours and days and months and years go by; the past returns no more, and what is to be we cannot know; but whatever the time gives us in which we live, we should therefore be content.”