"Guardeth thine very soul and harden thy resolve lest thy inner weaknesses provide a gateway for the denizens of the Immaterium. Pride and petty jealousies are as beacons to them. Beware, for they shall feed on thy very fear itself.
These befouled daemons and their insidious ways hath brought low even they that were created in the very image of the God-Emperor himself.
Seeketh not power. Seeketh not glory, lest it be in His name.
Purge the corrupted. Purge the damned. For their very befouled nature itself shall propagate and spread if left unchecked.
They are beyond redemption, they who were once as Brothers. Smite them, for you shall be as instruments of His holy wrath.
The Emperor protects."
Excerpt from the Battle Catechisms of Brother Chaplain Clovis Baeleon, Dark Angels 9th Company.