“The hours of a wise man are lengthened by his ideas”

“Who knows, the mind has the key to all things besides”

“Be wise with speed; a fool at forty is a fool indeed”

“One should take good care not to grow too wise for so great a pleasure of life as laughter”

“If you wish to succeed in life, make perseverance your bosom friend, experience your wise counselor, caution your elder brother, and hope your guardian genius”

“The utmost extent of man's knowledge, is to know that he knows nothing”