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Possibly the biggest philosophical question on my mind is this: why should we do anything at all? Or, why should we do one thing and not another? What is it to have a reason for action, a reason to do anything? It’s difficult to have a coherent ethics without answering this question in some respect; but in some ways it’s even more difficult to answer the question itself.
There are, I think, two basic classes of answer to this question, which analytic philosophers classify as internalism and externalism with respect to ethical motivation. On an internalist view, to have a reason to do something is to have a motivation, perhaps even a desire, to do it. If you don’t at some level want to do something, or at least feel or believe that you should do it, then you shouldn’t do it. On an externalist view, by contrast, reasons are independent of us. There are things we just should do, period, whether or not we have any desire or other motivation to do them.