Diligent: "having or showing care and conscientiousness in one's work or duties."
Integrity: "the quality of being honest and having strong moral principles; moral uprightness."
Vigilance: "the action or state of keeping careful watch for possible danger or difficulties."
Austerity: "sternness or severity of manner or attitude."
Maxim: "a short, pithy statement expressing a general truth or rule of conduct."
Axiom: "a statement or proposition which is regarded as being established, accepted, or self-evidently true."
Precept: "a general rule intended to regulate behavior or thought."
Didactic: "intended to teach, particularly in having moral instruction as an ulterior motive."
Platitude: "a remark or statement, especially one with a moral content, that has been used too often to be interesting or thoughtful."
Untenable: "(especially of a position or view) not able to be maintained or defended against attack or objection."