Quote from ACIM Text Chapter 4, Section 2 - Right Teaching and Right Learning.

The ego tries to exploit all situations into forms of praise for itself in order to overcome its doubts. It will remain doubtful as long as you believe in its existence. You who made it cannot trust it, because in your right mind you realize it is not real. The only sane solution is not to try to change reality, which is indeed a fearful attempt, but to accept it as it is. You are part of reality, which stands unchanged beyond the reach of your ego but within easy reach of spirit. When you are afraid, be still and know that God is real, and you are his beloved son in whom he is well pleased. Do not let your ego dispute this, because the ego cannot know what is as far beyond its reach as you are.