The worst waste of time is arguing with the fool and fanatic who does not care about truth or reality, but only the victory of his beliefs and illusions. Never waste time on arguments that don't make sense... When ignorance screams, intelligence is silent. Your peace and quiet are worth more. 

Rumi (1207-1273), Jalāl ad-Dīn Muhammad Rūmī-more popularly simply as Rumi was a 13th-century Persian poet, faqih, Islamic scholar, theologian, and Sufi mystic originally from Greater Khorasan.