In order to make the choices required to achieve his goals, a man needs the constant, automatized awareness of the principle which the anti-concept “duty” has all but obliterated in his mind: the principle of causality — specifically, of Aristotelian final causation (which, in fact, applies only to a conscious being), i.e., the process by which an end determines the means, i.e., the process of choosing a goal and taking the actions necessary to achieve it.
In a rational ethics, it is causality — not “duty” — that serves as the guiding principle in considering, evaluating and choosing one’s actions, particularly those necessary to achieve a long-range goal. Following this principle, a man does not act without knowing the purpose of his action. In choosing a goal, he considers the means required to achieve it, he weighs the value of the goal against the difficulties of the means and against the full, hierarchical context of all his other values and goals. He does not demand the impossible of himself, and he does not decide too easily which things are impossible. He never drops the context of the knowledge available to him, and never evades reality, realizing fully that his goal will not be granted to him by any power other than his own action, and, should he evade, it is not some Kantian authority that he would be cheating, but himself.