For the Scepticism, as I said, is not intellectual only; it is moral also; a chronic atrophy and disease of the whole soul. A man lives by believing something; not by debating and arguing about many things.

Thomas Carlyle (1795-1881) Scottish essayist and historian

Lecture (1840-05-19), “The Hero as Man of Letters,” Home House, Portman Square, London
    (Source)

The lecture notes were collected by Carlyle into On Heroes, Hero-Worship, & the Heroic in History, Lecture 5 (1841).