God has instituted in our time holy wars, so that
the order of knights
and the crowd running in their wake, who following the
example of the ancient pagans have been engaged in
slaughtering one another, might find a new way of gaining
salvation.
-Guibert of Nogent fl.c.1097 c.1097
Gesta Dei per Francos, in Recueil des historiens de croisades
occidentaux, edited by L'Acade mie des Inscriptions et Belles-Lettres
(1847^95), vol.4, p.124.