A white-hot spear of sound impaled Cassius. The pain burst in his mind and black spots flared before his eyes. He felt himself falling.
Pain was nothing. A Space Marine did not fear it- he did not fear anything. But the loss of control was abhorrent. the thought of being rendered helpless was so offensive that Cassius took hold of that rage and clung to it, splitting the conscious part of himself away from the substance of his brain overwhelmed by the assault.
He rode it out. A lesser mind would have been consumed, but Cassius, the Master of Sanctity, had been conditioned and counselled by Lord Tigurius in the mental discipline required by a Chaplain of Space Marines.

Space Marine Legends: Cassius (ebook)