Will, habit, and the limits of character
If insight does not change you, what does?
What it argues
Virtues are hexeis, stable dispositions produced by repeated activity, the way a builder becomes a builder by building. Knowing the good is not the mechanism; practice is. Character is therefore an engineering problem about repeated acts, not a matter of insight.
The probe
Name one disposition you want. Write the smallest repeated act that would produce it, and how often you would have to do it.
The source
Nicomachean Ethics, II.1-4 — Aristotle, c. 340 BCE. The link goes to the text or to a catalogue record for it, not to a summary. This one is the text itself.