of which we have spoken have therefore been assigned to this world from the beginning of time. Cain and Abel were one pair. The second was the giants and Noah; the third, Pharaoh and Abraham; the fourth, the Philistines and Isaac; the fifth, Esau and Jacob; the sixth, the magicians and Moses the lawgiver; the seventh, the tempter and the Son of man; the eighth, Simon and I, Peter; the ninth, all nations, and he who shall be sent to sow the word among the nations; the tenth, Antichrist and Christ. Concerning these pairs we shall give you fuller information at another time." When Peter spoke thus, Aquila said: "Truly there is need of constant teaching, that one may learn what is true about everything."
 [On the doctrine of pairs compare Homily II. 15, etc., 33; III. 23.--R.]