“When one knows properly these points, his understanding of the Faith is right and healthy; but if he mistakes any such points, forthwith he falls into heresy” (Against the Arians I 12,50).
“Then we who are left alive will be carried off together with them in the clouds to meet the Lord in the air, and thus we shall always be with the Lord.”
“Then there will be two in the field. One will be taken and the other left. Two will be grinding at the mill. One will be taken and the other left. Therefore, be vigilant, for you do not know on what day your Lord will come.”
“…this change which takes place…when the resurrection trumpet sounds which awakens the dead in an instant transforms those who are left alive to incorruptibility according to the likeness of those who have undergone the resurrection change, so that the bulk of the flesh is no longer heavy nor does its weight hold them down to earth, but they rise up through the air…” (“On the Making of Man” 22,6).
“If He is about to descend, why shall we be taken up? For the sake of honor. When a king enters a city, those who are in his favor go out to meet him, but the condemned await their judge inside. Or, when a loving father comes, his children, and also those worthy of being his children, are taken out in a chariot to see and kiss him, but the servants who have offended him remain indoors. So we are carried out upon a chariot to our Father…See how great our honor is? As He descends we go out to meet Him, and what is more blessed, we shall be with Him always” (Homily 8 on Thessalonians).