Because the utmost perfection of love cannot go beyond the love of enemies, therefore as soon as the Lord has bid us love our enemies, He proceeds, “Be ye then perfect, as your Father which is in heaven is perfect.” He indeed is perfect, as being omnipotent; man, as being aided by the Omnipotent. For the word ‘as’ is used in Scripture, sometimes for identity, and equality, as in that, “As I was with Moses, so will I be with thee;” [Josh 1:5] sometimes to express likeness only as here.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).