quality:corruption, structural:scholar_edition, structural:reformatting, linguistic:voice_change, linguistic:paraphrasing
Kantianism

Immanuel Kant 's theory of ethics is considered deontological for several different reasons. First, Kant argues that in order to act in the morally right way, people must act from duty (Pflicht). Second, Kant argued that it was not the consequences of actions that make them right or wrong, but the motives of the person who carries out the action.

Kant's first argument begins with the premise that the highest good must be both good in itself and good without qualification. Something is " good in itself " when it is intrinsically good; and is " good without qualification " when the addition of that thing never makes a situation ethically worse. Kant then argues that those things that are usually thought to be good, such as intelligence, perseverance, and pleasure, fail to be either intrinsically good or good without qualification. Pleasure, for example, appears not to be good without qualification, because when people take pleasure in watching someone suffer, this seems to make the situation ethically worse. He concludes that there is only one thing that is truly good:

Nothing in the world—indeed nothing even beyond the world—can possibly be conceived which could be called good without qualification except a good will.

Kant then argues that the consequences of an act of willing cannot be used to determine that the person has a good will; good consequences could arise by accident from an action that was motivated by a desire to cause harm to an innocent person, and bad consequences could arise from an action that was well-motivated. Instead, he claims, a person has a good will when they "act out of respect for the moral law." People "act out of respect for the moral law" when they act in some way because they have a duty to do so. Thus, the only thing that is truly good in itself is a good will, and a good will is only good when the willer chooses to do something because it is that person's duty; i.e., out of respect for the law. He defines respect as "the concept of a worth which thwarts my self-love."

Kant's three significant formulations of the categorical imperative (a way of evaluating motivations for action) are:

Kant argued that the only absolutely good thing is a good will, and so the single determining factor of whether an action is morally right is the will, or motive of the person doing it. If they are acting on a bad maxim—e.g., 'I will lie'—then their action is wrong, even if some good consequences come of it.

In his essay, " On a Supposed Right to Lie Because of Philanthropic Concerns ", arguing against the position of Benjamin Constant, Des réactions politiques, Kant states that:

Hence a lie defined merely as an intentionally untruthful declaration to another man does not require the additional condition that it must do harm to another, as jurists require in their definition (mendacium est falsiloquium in praeiudicium alterius). For a lie always harms another; if not some human being, then it nevertheless does harm to humanity in general, inasmuch as it vitiates the very source of right.… All practical principles of right must contain rigorous truth.… This is because such exceptions would destroy the universality on account of which alone they bear the name of principles.