Full Idea
Aristotle is not giving us a bland reminder that virtue takes practice; rather, practice has cognitive powers, in that it is the way that we learn what is noble and just.
Gist of Idea
We must practise virtuous acts because practice actually teaches us the nature of virtue
Source
comment on Aristotle (Nicomachean Ethics [c.334 BCE], 1104b02) by Myles F. Burnyeat - Aristotle on Learning to be Good p.73
Book Reference
'Essays on Aristotle's Ethics', ed/tr. Rorty,Amélie Oksenberg [University of California 1980], p.73
A Reaction
Interesting. This seems right about Aristotle, and suggests that we come to appreciate the arts (for example) by doing them rather than studying them. (NE 1147a21)