Stobaeus, Selections 2.7.13 (116.19–152.5 Wachsmuth 1884)

{13} From Aristotle and the other Peripatetics, on ethics.

(1) He says that character [ēthos] took its name from habit [ethos]; for perfection in those things of which we have the beginnings and seeds from nature [117] is achieved by habit and correct training. For this reason the [science] of character is concerned with habit and is concerned only with living creatures and most of all with human beings. For the others through habituation take on certain characters not through reason but by necessity, but a human being is moulded by reason as a result of habituation, when the <irrational> part of the soul is disposed according to reason. What is [here] called the irrational part of the soul is not that which is simply irrational, but that which can obey reason, and this is what the emotional [pathētikos] [part] is like, which is that which can admit virtue.