The mental illness that is called paranoid schizophrenia, or paranoia for short, is essentially an exaggerated form of ego. It usually consists of a fictitious story the mind has invented to make sense of a persistent underlying feeling of fear. The main element of the story is the belief that certain people (sometimes large numbers or almost everyone) are plotting against me, or are conspiring to control or kill me. The story often has an inner consistency and logic so that it sometimes fools others into believing it too. Sometimes ...

Eckhart Tolle

from A New Earth: Awakening to Your Life's Purpose