VIII. (34) A stationary position and motion differ from one another; for the one is a state of tranquillity, but motion is impetuosity, of which last there are two speciesùthe one that which changes its place, the other that which is constantly revolving about the same place. Now habit is closely akin to the stationary position, and energy to motion; (35) and what we have here said may be more easily understood by an appropriate example. It is customary to call an architect, or a painter, or a farmer, or a musician (and so on with other artists), by the aforesaid name of their profession, even if they remain inactive, doing nothing in the way of working at their respective arts, with reference to the skill and knowledge which they have each of them acquired in their respective professions; (36) but when the architect has taken a material of wood and is working it up, and when the painter having mixed his proper colours on his pallet, paints the figures which he has in his head; and when, again, the former cutting furrows in the earth, throws in the seed, and plants, cuttings, and shoots of tree; and when, also, by way of supplying what he has planted with nourishment, he waters them and draws up channels of water to their roots, and does every thing else which a farmer may be expected to do; and also, when the musician adapts metres, and rhythm, and all kinds of melody to his flutes, and harps, and other instruments, and is able even without any manufactures instruments to use the organ with which he is furnished by nature by means of his voice which is furnished with all the tones; and so on with all the other artists, if it were worth while to mention them separately. In all these cases, besides the aforesaid names derived from their profession, other names akin to the former ones are added with reference to their work; so that we predicate of the architect that he builds, of the painter that he portrays, of the farmer that he cultivates the land, of the musician that he plays the flute or the harp, or that he sings, or does something similar. (37) Now, what men are followed by praise and blame? Is it not those men who energise and do something? For when they succeed they meet with praise; and when, on the other hand, they fail they incur blame; but those who are scientific, without proceeding to action, remain in tranquillity having attained this one honour unattended with danger, namely, peace.