The precepts are normative rules, but are formulated and understood as "undertakings" rather than commandments enforced by a moral authority, according to the voluntary and gradualist standards of Buddhist ethics. They are forms of restraint formulated in negative terms, but are also accompanied by virtues and positive behaviors, which are cultivated through the practice of the precepts. The most important of these virtues is non-harming (Pāli and ), which underlies all of the five precepts. Precisely, the texts say that one should keep the precepts, adhering to the principle of comparing oneself with others: