John Chrysostom
By this single saying he strikes fear into all those who made their members members of a harlot, who caused the brethren to stumble by eating sacrifices to idols, who called themselves by the names of men, and who did not believe the resurrection.
He not only strikes fear into them, but also points out the way to virtue and the source of vices. Just as love for Christ, when it is strong, drives out and destroys every kind of sin, so also, when it is weak, it allows them to grow.
"Maranatha." Why was this said, and moreover in Hebrew? Since the cause of all evils was arrogance, which came from outward, pagan wisdom, and this arrogance was the chief evil that especially divided the Corinthians, the Apostle wished to cast down their arrogance.
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Therefore he uses not a Greek expression, but a Hebrew one. By this he shows that he is not ashamed of simplicity. On the contrary, he loves it greatly. What does "Maranatha" mean? Our Lord has come.
Why does he say this? To confirm the teaching concerning the divine economy, since the seeds of the resurrection are chiefly contained in this. He also says it to shame them, as though saying: the common Master of all deigned to humble Himself to such an extent, and do you still remain in the same condition and continue to sin?
Are you not struck by His exceeding love, the greatest of all blessings? Remember this one thing alone, he says, and you will be able to advance in every virtue and destroy every sin.