Every art, and every science reduced to a teachable form, and in like manner every action and moral choice, aims, it is thought, at some good: for which reason a common and by no means a bad description of the Chief Good is, "that which all things aim at."

Now there plainly is a difference in the Ends proposed: for in some cases they are acts of working, and in others certain works or tangible results beyond and beside the acts of working: and where there are certain Ends beyond and beside the actions, the works are in their nature better than the acts of working. Again, since actions and arts and sciences are many, the Ends likewise come to be many: of the healing art, for instance, health; of the ship-building art, a vessel; of the military art, victory; and of domestic management, wealth; are respectively the Ends.

And whatever of such actions, arts, or sciences range under some one faculty (as under that of horsemanship the art of making bridles, and all that are connected with the manufacture of horse-furniture in general; this itself again, and every action connected with war, under the military art; and in the same way others under others), in all such, the Ends of the master-arts are more choice-worthy than those ranging under them, because it is with a view to the former that the latter are pursued.

(And in this comparison it makes no difference whether the acts of working are themselves the Ends of the actions, or something further beside them, as is the case in the arts and sciences we have been just speaking of.)

[Sidenote: II] Since then of all things which may be done there is some one End which we desire for its own sake, and with a view to which we desire everything else; and since we do not choose in all instances with a further End in view (for then men would go on without limit, and so the desire would be unsatisfied and fruitless), this plainly must be the Chief Good, _i.e._ the best thing of all.

Surely then, even with reference to actual life and conduct, the knowledge of it must have great weight; and like archers, with a mark in view, we shall be more likely to hit upon what is right: and if so, we ought to try to describe, in outline at least, what it is and of which of the sciences and faculties it is the End.