Daniel J. Flynn said this quote

“ What never fails inside the mind of an intellectual never works outside the confines of his head. The world’s stubborn refusal to vindicate the intellectual’s theories serves as proof of humanity’s irrationality, not his own. Thus, the true believer retrenches rather than rethinks; he launches a war on the world, denying reality because it fails to conform to his theories. If intellectuals are not prepared to reconcile theory and practice, then why do they bother to venture outside the ivory tower or the coffeehouse? Why not stay in the world of abstractions and fantasy? ”