For one death, that namely of the Saviour according to the body, was to us a salvation from two deaths, both of soul and body, and His one resurrection gained for us two resurrections. This ratio of two to one springs out of the number three; for one and two are three.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Trin., iv, 3
