Augustine of Hippo — as excerpted in the Catena Aurea on John 19:16-18

“(Tr. xxxi. in fin.) Yea, even the cross, if thou consider it, was a judgment seat: for the Judge being the middle, one thief, who believed, was pardoned, the other, who mocked, was damned: a sign of what He would once do to the quick and dead, place the one on His right hand, the other on His left.”