That is the sum of religion; an all-comprehensive precept which includes a great deal more than the world’s morality, and which changes the coldness of that into something blessed, by referring all our purity to the Lord that called us. One may well wonder where a Galilean fisherman got the impulse that lifted him to such a height; one may well wonder that he ventured to address such wide, absolute commandments to the handful of people just dragged from the very slough and filth of heathenism to whom he spoke. But he had dwelt with Christ, and they had Christ in their hearts. So for him to command and for them to obey, and to aim after even so wide and wonderful an attainment as perfecting like God’s was the most natural thing in the world. ‘Be ye holy as He that hath called you is holy, and that in all manner of conversation.’ The maximum of possible attainment, the minimum of imperative duty!
- MacLaren Expositions