Aristotle, Nicomachean Ethics
H. Rackham, Ed.

It follows also that pleasure is not a form of motion.¹ For every motion or process of change involves duration, and is a means to an end, for instance the process of building a house; and it is perfect when it has effected its end. Hence a motion is perfect either when viewed over the whole time of its duration, or at the moment when its end has been achieved. The several motions occupying portions of the time of the whole are imperfect, and different in kind from the whole and from each other. For instance, in building a temple the fitting together of the stones is a different process from the fluting of a column, and both are different from the construction of the temple as a whole; and whereas the building of the temple is a perfect process, for nothing more is required to achieve the end proposed, laying the foundation and constructing the triglyphs are imperfect processes, since each produces only a part of the design; they are therefore specifically different from the construction of the whole, and it is not possible to lay one's finger on a motion specifically perfect at any moment of the process of building, but only, if at all, in the whole of its duration.