Those who believe they believe in God, but without passion in the heart, without anguish of mind, without uncertainty, without doubt, and even at times without despair, believe only in the idea of God, and not in God himself.

About Miguel de Unamuno

Miguel de Unamuno y Jugo (Spanish: [miˈɣ̞el ð̞e̞ u.naˈmu.no i ˈxu.ɣ̞o]; 29 September 1864 – 31 December 1936) was a Spanish essayist, novelist, poet, playwright, philosopher, professor of Greek and Classics, and later rector at the University of Salamanca.