Even when Judas fell, Matthias at once came into his place, so that the number twelve was preserved. Therefore our Lord did not choose twelve disciples by chance, but to show that He Himself is the Day in a spiritual sense.
Let the hours be illumined by the light of the day, so that through the preaching of the hours the world may believe in the day. "Therefore follow Me," says the Lord, "if you do not wish to stumble."
Thus, when men decided to advise God, disciples the Teacher, slaves the Lord, and the sick the Physician, He rebuked them and said, "Are there not twelve hours in the day? If anyone walks in the day, he does not stumble" (Jn 11:9-10).
"Follow Me, if you do not wish to stumble. Do not give Me counsel, for it is for you to receive counsel from Me." To what, then, does this refer: "Are there not twelve hours in the day?"
To show that He is the day, He chose twelve disciples. One must remember that in antiquity day and night were each divided into twelve hours, independently of one another.
At every season of the year, even during short winter days, the day consisted of twelve hours. Their length differed from the hours of the night, except at the equinoxes.
Therefore both in the Gospel text and in blessed Augustine, the reference is not to twelve hours of the full day and night, but precisely to daylight without night.
"If," He says, "I am the day, and you are the hours, do the hours give counsel to the day? The hours follow the day, not the day the hours."
If they were the hours, what of Judas? Was he numbered among the twelve hours? If he was an hour of the day, he had light. If he had light, how did he betray the day to death?
But under this word the Lord foresaw not Judas himself, but his successor. After Judas fell away, Matthias took his place, and the number twelve was preserved (see Acts 1:26).
Thus the Lord did not choose twelve disciples merely so, but to show that in a spiritual sense He is the day.
Let the hours follow the day. Let the hours preach the day. Let the hours be filled with light from the day. Let the hours be filled with radiance from the day.
Through the preaching of the hours, let the world believe in the day. This is what He said in brief: "Follow Me, if you do not wish to stumble."