virtue (n) an example of moral goodness or excellence.

excellent (adj) of the highest or finest quality; exceptionally good of its kind.

excellence (n) a virtue; the state, quality, or condition of being excellent or exceptionally good; exalted merit; superiority.

I am careful not to confuse excellence with perfection. Excellence I can reach for, perfection is God’s business. – Michael J. Fox

We are what we repeatedly do. Excellence then, is not an act, but a habit. – Aristotle

If you want to achieve excellence, you can get there today. As of this second, quit doing less-than-excellent work. – Thomas J. Watson, Sr.