 Now above these three was the eagle; so in the soul, they say, above the other three elements and beyond them is a fourth, which the Greeks call synderesis. This is that spark of conscience which was not quenched even in the heart of Cain, when he was driven out of paradise. This it is that which makes us, too, feel our sinfulness when we are overcome by evil Desire or unbridled Spirit, or deceived by sham Reason. It is natural to identify synderesis with the eagle, since it is distinct from the other three elements and corrects them when they err […] However, we also see that this conscience (conscientia) is cast down in some people, who have neither shame nor insight regarding their offences, and loses its place […]. (commentary on Ezekiel 1.7; D’Arcy trans. 1961: 16–17)