Normally we operate under the deluded assumption that everything has some sort of true, substantial reality. But when we look more carefully, we find that the phenomenal world is like a rainbow - vivid and colourful, but without any tangible existence.
Dilgo Khyentse Rinpoche, Tibetan Buddhist Master. In memory, 1910 - 1991.
The Ultimate Principle of Reality - All that has a form is illusive and unreal.
The belief you have a terminal illness can actually cause you to die, and negative thinking is much more common in our current world.