The morality of an action is its bearing on the principles of ethics. The nature and the circumstances of an action are the source of its morality. By its nature is meant the intrinsic tendency of an action; by its circumstances those qualities of person, time, place, thing, means, method, and especially end, or intention, that clothe the act in concrete form.
In the concrete every human act is either morally good or bad. The essential morality of an act flows from its nature or object; its accidental morality from the circumstances.