20.

For it is as ‘sons,’ not as the Son; as ‘gods,’ not as He Himself; and not as the Father, but ‘merciful as the Father.’ And, as has been said, by so becoming one, as the Father and the Son, we shall be such, not as the Father is by nature in the Son and the Son in the Father, but according to our own nature, and as it is possible for us thence to be moulded and to learn how we ought to be one, just as we learned also to be merciful. For like things are naturally one with like; thus all flesh is ranked together in kind ¹; but the Word is unlike us and like the Father. And therefore, while He is in nature and truth one with His own Father, we, as being of one kind with each other (for from one were all made, and one is the nature of all men), become one with each other in good disposition ², having as our copy the Son’s natural unity with the Father. For as He taught us meekness from Himself, saying, ‘Learn of Me for I am meek and lowly in heart ³,’ not that we may become equal to Him, which is impossible, but that looking towards Him, we may remain meek continually, so also here wishing that our good disposition towards each other should be true and firm and indissoluble, from Himself taking the pattern, He says, ‘that they may be one as We are,’ whose oneness is indivisible; that is, that they learning from us of that indivisible Nature, may preserve in like manner agreement one with another. And this imitation of natural conditions is especially safe for man, as has been said; for, since they remain and never change, whereas the conduct of men is very changeable, one may look to what is unchangeable by nature, and avoid what is bad and remodel himself on what is best.