Our Essence of Mind which is the seed or kernel of enlightenment is pure by nature, and by making use of this mind alone we can reach Buddhahood directly.
6th Patriarch Hui Neng
The Platform Sutra (A.F. Price and Wong Mou-Lam)
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.