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.
We have all learned to become sensitive to the physical environment … Perhaps fewer of us are sensitive to what we might call the moral or ethical environment. This is the surrounding climate of ideas about how to live. It determines what we find acceptable or unacceptable, admirable or contemptible. It determines our conception of when things are going well and when they are going badly.