Ambition is a very dangerous thing because either you achieve it and your life ends prematurely, or you don't, in which case your life is a constant source of disappointment. You must never have ambition.
It's good to test yourself and develop your talents and ambitions as fully as you can and achieve greater success; but I think success is the feeling you get from a job well done, and the key thing is to do the work.
Achieving life is not the equivalent of avoiding death.
Ambitions tend to remain undisturbed by realities.
Your mind is nirvana.