And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
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“Then will appear the sign of the Son of man in heaven.” The cross will be brighter than the sun. The sun will be darkened and hide itself. The sun will appear at times when it would not normally appear. But why is this sign given? In order that the brazenness of the Jews might be more abundantly silenced. For having the cross as the greatest plea, the Son of man thus comes to that judgment seat, showing not only his wounds but also the reproach of his death. The Gospel of Matthew, Homily