If the individual mind were completely cut off from the Universal Mind, if it really lived in a realm composed only of its own thoughts, then the formation and continuation of the world-image would be fully under its control. But this is not the case. Consequently it lacks the freedom to mold the body-thought as it would or prolong its life at will.

-- Notebooks Category 10: Healing of the Self > Chapter 1: The Laws of Nature > # 34