A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.

Robert A. Heinlein

Some people's insecurity and ego fragility cannot tolerate the slightest offense.

Robert Greene

If you prefer to not play the game and to always be honest and upfront, do not complain when others call you obnoxious and arrogant.

Robert Greene

Your ego can become an obstacle to your work. If you start believing in your greatness, it is the death of your creativity.

Marina Abramović

The ego relies on the familiar. It is reluctant to experience the unknown, which is they very essence of life.

Deepak Chopra

Midlife is the time to let go of an overdominant ego and to contemplate the deeper significance of human existence.

Carl Gustav Jung