When one person suffers from a delusion it is called insanity; when many people suffer from a delusion it is called religion.Robert Pirsig
It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.Carl Sagan
The most successful people I know believe in themselves almost to the point of delusion.Naval Ravikant
The fundamental delusion - there is something out there that will make me happy and fulfilled forever.David Foster Wallace