 Philosopher Chandran Kukathas said Rand's position on this point "brought notoriety, but kept her out of the intellectual mainstream".Rand acknowledged in the book's introduction that the term 'selfishness' was not typically used to describe virtuous behavior, but insisted that her usage was consistent with a more precise meaning of the term as simply "concern with one's own interests".The equation of selfishness with evil, Rand said, had caused "the arrested moral development of mankind" and needed to be rejected.