 For Thomas Aquinas, as for Aristotle, doing moral philosophy is thinking as generally as possible about what I should choose to do (and not to do), considering my whole life as a field of opportunity (or misuse of opportunity). Thinking as general as this concerns not merely my own opportunities, but the kinds of good things that any human being can do and achieve, or be deprived of. Thinking about what to do is conveniently labeled “practical”, and is concerned with what and how to choose and do what one intelligently and reasonably can (i) to achieve intelligible goods in one’s own life and the lives of other human beings and their environment, and (ii) to be of good character and live a life that as a whole will have been a reasonable response to such opportunities.