Excellence or virtue is a ...

Excellence or virtue is a settled disposition of the mind that determines our choice of actions and emotions and consists essentially in observing the mean relative to us ... a mean between two vices, that which depends on excess and that which depends on defect.
Excellence or virtue is a settled disposition of the mind that determines our choice of actions and emotions and consists essentially in observing the mean relative to us ... a mean between two vices, that which depends on excess and that which depends on defect.

Quotes from the same author

It is the mark of an educated mind to be able to entertain a thought without accepting it.
Change in all things is sweet.
Well begun is half done.
In all things of nature there is something of the marvelous.
Happiness depends upon ourselves.