"The acceptance of full responsibility for one's own choices and actions (and their consequences) is such a demanding moral discipline that many men seek to escape it by surrendering to what they believe is the easy, automatic, unthinking safety of a morality of "duty." They learn better, often when it is too late.
The disciple of causation faces life without inexplicable chains, unchosen burdens, impossible demands or supernatural threats. His metaphysical attitude and guiding moral principle can best be summed up by an old Spanish proverb: "God said: 'Take what you want and pay for it.'" But to know one's own desires, their meaning and their costs requires the highest human virtue: rationality."
~ Found at Ayn Rand Lexicon - Duty
