Amy Poehler said this quote

You will never climb Career Mountain and get to the top and shout, ‘I made it!’ You will rarely feel done or complete or even successful. Most people I know struggle with that complicated soup of feeling slighted on one hand and like a total fraud on the other. Our ego is a monster that loves to sit at the head of the table, and I have learned that my ego is just as rude and loud and hungry as everyone else’s. It doesn’t matter how much you get; you are left wanting more. Success is filled with MSG.