This is an outline and summary of three of the most prominent ethical theories in the history of philosophy. (Note that all three of these represent different ethical absolutist/universalist theories. A view known as ethical relativism follows these.) Please take this as a sketch that invites you to investigate these ethical theories further. After each brief sketch, I will provide some web links that will be helpful to read.
Virtue Ethics (especially Aristotle)
From Wikipedia (http://en.wikipedia.org/wiki/Virtue_ethics):
“Virtue ethics is a branch of moral philosophy that emphasizes character, rather than rules or consequences, as the key element of ethical thinking. In the West virtue ethics was the prevailing approach to ethical thinking in the ancient and medieval periods. The tradition suffered an eclipse during the early modern period, as Aristotelianism fell out of favour in the West. Virtue ethics returned to prominence in Western philosophical thought in the twentieth century, and is today one of the three dominant approaches to normative ethics (the other two being deontology and consequentialism).”
“A system of virtue ethics, having offered an account of the good life, then identifies those habits and behaviours that will allow a person to achieve that good life: these habits and behaviours are the virtues (arête). In the course of one's activities one will have opportunity to practice these virtues. Sometimes these virtues will be, or will seem to be, in conflict with one another: a common dilemma is the apparent conflict between honesty and compassion, when telling a friend the truth (about his appearance, say) would hurt that friend's feelings. In such cases the agent must exercise her practical wisdom (phronesis) to resolve the conflict. Ultimately, a lifetime of practicing these virtues will allow the agent to flourish and live the good life (eudaimonia). In fact, in most accounts, practicing the virtues