Quote from A Course in Miracles Text Chapter 8, Section 9 - Healing as Corrected Perception.

The ego, which always wants to weaken the mind, tries to separate it from the body in an attempt to destroy it. Yet the ego actually believes that it is protecting it. This is because the ego believes that mind is dangerous, and that to make mindless is to heal. But to make mindless is impossible, since it would mean to make nothing out of what God created. The ego despises weakness, even though it makes every effort to induce it. The ego wants only what it hates. To the ego this is perfectly sensible. Believing in the power of attack, the ego wants attack.

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