Every art and every inquiry, and similarly every action and pursuit, is thought to aim at some good; and for this reason the good has rightly been declared to be that at which all things aim.
Now we call that which is in itself worthy of pursuit more final than that which is worthy of pursuit for the sake of something else. Therefore we call final without qualification that which is always desirable in itself and never for the sake of something else. Now such a thing happiness, above all else, is held to be.
For this reason also the man who is to be good must be well trained and habituated. One swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.
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