Ethics?
Deontological moral systems are characterized by a focus upon adherence to independent moral rules or duties. To make the correct moral choices, we have to understand what our moral duties are and what correct rules exist to regulate those duties. When we follow our duty, we are behaving morally. When we fail to follow our duty, we are behaving immorally. Typically in any deontological system, our duties, rules, and obligations are determined by God. Being moral is thus a matter of obeying God.
Deontological moral systems typically stress the reasons why certain actions are performed. Simply following the correct moral rules is often not sufficient; instead, we have to have the correct motivations. This might allow a person to not be considered immoral even though they have broken a moral rule, but only so long as they were motivated to adhere to some correct moral duty.
Nevertheless, a correct motivation alone is never a justification for an action in a deontological moral system and cannot be used as a basis for describing an action as morally correct. It is also not enough to simply believe that something is the correct duty to follow. Duties and obligations must be determined objectively and absolutely, not subjectively. There is no room in deontological systems of subjective feelings; on the contrary, most adherents condemn subjectivism and relativism in all their forms.
Perhaps the most significant thing to understand about deontological moral systems is that their moral principles are completely separated from any consequences which following those principles might have. Thus, if you have a moral duty not to lie, then lying is always wrong — even if that results in harm to others. For example, you would be acting immorally if you lied to Nazis about where Jews were hiding.
The word deontology comes from the Greek roots deon, which means duty,