Christ, "Behold, I stand at the door & knock; if anyone hears My voice & opens the door, I will come in to him and will sup with him and he with Me. Notice, there is no doorknob. You must open the door.
1 Thessalonians For the Lord himself will come down from heaven with a commanding shout, with the voice of the archangel, and with the trumpet call of God. First, the Christians who have died will rise from their graves.
Cyprian, De bono patientiae, the disturbances of Good Friday signify creation's distress over the death of its Creator. The sun in particular withdraws its rays to look away, lest it be forced to gaze upon the crime of Jesus' enemies.