there are two fundamentally different kinds of externals: the conditions of your life and the voluntary activities that you undertake.33 Conditions include facts about your life that you can’t change (race, sex, age, disability) as well as things that you can (wealth, marital status, where you live). Conditions are constant over time, at least during a period in your life, and so they are the sorts of things that you are likely to adapt to. Voluntary activities, on the other hand, are the things that you choose to do, such as meditation, exercise, learning a new skill, or taking a vacation.
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