Happiness, the self and human flourishing

It may even be held that [the intellect] is the true self of each, inasmuch as it is the dominant and better part; and therefore it would be a strange thing if a man should choose to live not his own life but the life of some other than himself. Moreover . . . that which is best and most pleasant for each creature is that which is proper to the nature of each; accordingly the life of the intellect is the best and the pleasantest life for man, inasmuch as the intellect more than anything else is man.