No more immoral act can be done by a human creature; for it is the beginning of all immorality, or rather it is the impossibility henceforth of any morality whatsoever: the innermost moral soul is paralyzed thereby, cast into fatal magnetic sleep! Men are no longer sincere men.
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“"you only believe that you believe." It is the final scene in all kinds of Worship and Symbolism; the sure symptom that death is now nigh. It is equivalent to what we call Formulism, and Worship of Formulas, in these days of ours. No more immoral act can be done by a human creature; for it is the beginning of all immorality, or rather it is the impossibility henceforth of any morality whatsoever: the innermost moral soul is paralyzed thereby, cast into fatal magnetic sleep! Men are no longer sincere men. I do not wonder that the earnest man denounces this, brands it, prosecutes it with inextinguishable aversion. He and it, all good and it, are at death-feud. Blamable Idolatry is Cant, and even what one may call Sincere-Cant.” source