Full Idea
The doctrine of the mean claims that virtues are not the polar opposites of vices, but rather stand between two vices which are opposed.
Gist of Idea
The mean implies that vices are opposed to one another, not to virtue
Source
report of Aristotle (Nicomachean Ethics [c.334 BCE], 1104a13) by Julia Annas - The Morality of Happiness 2.2
Book Reference
Annas,Julia: 'The Morality of Happiness' [OUP 1995], p.60
A Reaction
I'm not sure about that. If the two extremes of courage are cowardice and recklessness, how are those two opposed to one another?