Thomas Aquinas on happiness
A video course by Prof. Sir Anthony Kenny (Istituto di Studi Filosofici Lugano)
The great moral systems of Western philosophy may be divided into two classes. There are those whose key concept is that of happiness, and there are those whose key concept is that of obligation.
Systems of the first type may focus on the happiness of the individual (Aristotle) or on the happiness of the greatest number (Bentham). Systems of the second type may derive obligation from a divine law (Judaism) or may derive duty from a human legislative community (Kant).