Be Proud, Not Prideful

I was reading some of the Greek classics for a high school literature class when our teacher made us look hard at the notions of good pride (Megalopsuchia) and bad pride (Hubris), which we referred to as "pridefulness" in that class.
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Basically:
Pride = good. Being proud of your accomplishments is caring, and caring is the foundation of quality. Pride is the just reward for a job well done.
Pridefulness = bad. Being prideful is being arrogant and closed minded and putting yourself above others. In the Greek tragedies, it leads inexorably to an act of folly (Atë) which brings about destruction (Nemesis).

In business, the critical values of professionalism, collaboration, openness, and collegiality are not compatible with pridefulness.    The antidote to pridefulness is humility.

So be proud of the good work you do, the way you do it, and the results you achieve. Celebrate success with enthusiasm. But be always humble.