A person who thinks all the time has nothing to think about except faults, so he loses touch with reality and lives in a world of illusions.
By thought I mean the chattering inside the skull; perpetual and compulsive repetition of words, of calculations, and symbols going on inside the head.
For as a result of confusing the real world of nature with mere signs, such as money, stocks and bonds, title deeds, and so forth. This is a disaster. Time to wake up.
Alan Watts (1915-1973) who held both a master's degree in theology and a doctorate of divinity, is best known as an interpreter of Zen Buddhism in particular, and Indian and Chinese philosophy in general.
He authored more than 20 excellent books on the philosophy and psychology of religion, and lectured extensively, leaving behind a vast audio archive. With characteristic lucidity and humor Watts unravels the most obscure ontological and epistemological knots with the greatest of ease.