Ethics or moral philosophy is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong conduct. The term ethics derives from Ancient Greek ἠθικός (ethikos), from ἦθος (ethos), meaning 'habit, custom'. The branch of philosophy axiology comprises the sub-branches of ethics and aesthetics, each concerned with values.
Let me give you a definition of ethics: It is good to maintain and further life — it is bad to damage and destroy life. And this ethic, profound and universal, has the significance of a religion. It is religion.
Albert Schweitzer, quoted in Albert Schweitzer : The Man and His Mind (1947) by George Seaver, p. 366