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

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

“A contented mind is the greatest blessing a man can enjoy in this world”

“Cheerfulness keeps up a kind of daylight in the mind, filling it with a steady and perpetual serenity”

“Thought means life, since those who do not think so do not live in any high or real sense. Thinking makes the man”

“The investigation of the meaning of words is the beginning of education”