Be rigorous about your HR decisions. There is a difference between rigorous and ruthless.
If you have more than three priorities then you don't have any.
Greatness is not a function of circumstance. Greatness, it turns out, is largely a matter of conscious choice, and discipline.
By definition, it is not possible to everyone to be above the average.
How can we do better tomorrow than we did today?
...the question, Why try for greatness? would seem almost tautological. If you're doing something you care that much about, and you believe in its purpose deeply enough, then it is impossible to imagine not trying to make it great. It's just a given.