> Finally, I must at least address the question of whether greatness is worth the large effort it requires. Those who have done really great things generally report, privately, that it is better than wine, the opposite sex, and song put together. The realization that you have done it is overwhelming.

Is this just a momentary high, or does it result in a lasting effect on one's mood/disposition?

Reflecting on my personal (not "great") achievements, I'll feel a momentary sense of pride, which is a good thing to be able to feel from time to time, but largely inconsequential to my day-to-day.