Productive ability is a value by the standard of man's life—and because, like all values, a course of virtue is required in order to gain and keep it. An individual is not born with the knowledge, the skills, or the imaginative ideas that give rise to greatness or even competence in any creative field. He must acquire, then use, all these assets by a volitional process. At each step this process requires effort, purpose, and the commitment to reality. It requires all the attributes inherent in the development and use of the rational faculty, including conscientious focus, independent judgment, the concern with long-range goals, and the courage to remain true in action to one's knowledge.
Objectivism: The Philosophy of Ayn Rand, p. 295