And Jesus being full of the Holy Spirit returned from the Jordan, and was led by the Spirit into the wilderness,
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Augustine of Hippo
AD 430
Now that number is a sacrament of our time and labor, in which under Christ's discipline we contend against the devil, for it signifies our temporal life. For the periods of years run in courses of four, but forty contains four tens. Again, those ten are completed by the number one successively advancing on to four more. This plainly shows that the fast of forty days, i.e. the humiliation of the soul, the Law and the Prophets have consecrated by Moses and Elias, the Gospel by the fast of our Lord Himself.