“Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.”

“All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.”

“Anyone can become angry - that is easy, but to be angry with the right person at the right time, and for the right purpose and in the right way - that is not within everyone’s power and that is not easy.”

“Courage is the first of human qualities because it is the quality which guarantees the others.”

“Love is composed of a single soul inhabiting two bodies.”

“You will never do anything in this world without courage. It is the greatest quality of the mind next to honor.”

“The energy of the mind is the essence of life.”

“Criticism is something we can avoid easily by saying nothing, doing nothing, and being nothing”

“Great men are always of a nature originally melancholy.”

“Those that know, do. Those that understand, teach.”