The mind, once released from the ego’s thought system, has but to relearn the thought system of the truth. Your mind, heart and body have joined in alignment to bring this learning about. They now exist in harmony.
Your mind and heart in union have brought harmony to your body. Sustaining this harmony will keep your body in perfect health, even while the manner of this perfection of your health will remain one of many options.
Jesus, A Course of Love T4.7.6
Now you may fully realize the distinction between the ego-self that previously was the self of learning, and the Christ-Self that is now the Self of learning and experience.
You must take on the mantle of your new identity, your new Self.
Christ, A Course of Love T2.3.4
The extremes that we are talking of leaving behind are extreme of reaction to a chosen lesson. What you are being asked to leave behind is the need for such lessons.
If you have learned the curriculum, what further lessons are needed? What quite knowing cannot come to you in peace?
Why would you believe you can learn from the turmoil of extremes what you cannot learn in peace eternal?
~ Christ, A Course of Love T1.10.12