"Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all."

"The moral purpose of a man's life is the achievement of his own happiness."

"The most depraved type of human being is the man without a purpose."

"I am not primarily an advocate of capitalism, but of egoism; and I am not primarily an advocate of egoism, but of reason. If one observes the actual requirements of man’s survival and prosperity, one …"

"The man who speaks to you of duty, expects you to do his."