Fear seems to have many causes. Fear of loss, fear of failure, fear of being hurt, and so on, but ultimately all fear is the ego's fear of death, of annihilation. To the ego, death is always just around the corner. In this mind-identified state, fear of death affects every aspect of your life. For example, even such a seemingly trivial and "normal" thing as the compulsive need to be right in an argument and make the other person wrong—defending the mental position with which you have identified—is due to the fear of death. If you identify with a mental position, then if you are wrong, your mind-based sense of self is seriously threatened with annihilation. So you as the ego cannot afford to be wrong. To be wrong is to die. Wars have been fought over this, and countless relationships have broken down. Once you have disidentified from your mind, whether you are right or wrong makes no difference to your sense of self at all, so the forcefully compulsive and deeply unconscious need to be right, which is a form of violence, will no longer be there. You can state clearly and firmly how you feel or what you think, but there will be no aggressiveness or defensiveness about it. Your sense of self is then derived from a deeper and truer place within yourself, not from the mind. Watch out for any kind of defensiveness within yourself. What are you defending? An illusory identity, an image in your mind, a fictitious entity. By making this pattern conscious, by witnessing it, you disidentify from it. In the light of your consciousness, the unconscious pattern will then quickly dissolve. This is the end of all arguments and power games, which are so corrosive to relationships. Power over others is weakness disguised as strength.

Eckhart Tolle

from The Power of Now: A Guide to Spiritual Enlightenment