The more successful you become, the more the demands of your ego will increase. In the beginning, you simply want to succeed, but your ego will not be satisfied. When you become a little more successful your ego wants to kill your competition. And when you become even more successful, it wants to make you the universal king. There's no telling what ego wants because our desire doesn't have any limit; therefore, its demands continually increase.

-- Gelek Rimpoche