John 10:15

(Hom. lx. 1) Then that thou mayest not attribute to the Shepherd and the sheep the same measure of knowledge, He adds, As the Father knoweth Me, even so know I the Father: i. e. I know Him as certainly as He knoweth Me. This then is a case of like knowledge, the other is not; as He saith, No man knoweth who the Son is, but the Father. (Luke 10:23) (Hom. lx. 1) He gives it too as a proof of His authority. In the same way the Apostle maintains his own commission in opposition to the false Apostles, by enumerating his dangers and sufferings.

Then because His words appeared to be unsupported by testimony, (for though the, "I lay down My life," was not long after proved, yet the, "that they might have life, and that they might have more abundantly," was to come to pass after their departure hence in the life to come,) what doth He? He proveth one from the other; by giving His mortal life He proveth that He giveth life immortal.

"I lay down My life." This He saith continually, to show that He is no deceiver. So also the Apostle, when he desired to show that he was a genuine teacher, and was arguing against the false apostles, established his authority by his dangers and deaths, saying, "In stripes above measure, in deaths oft." For to say, "I am light," and "I am life," seemed to the foolish to be a matter of pride; but to say, "I am willing to die," admitted not any malice or envy. Wherefore they do not say to Him, "Thou bearest witness of thyself, thy witness is not true," for the speech manifested very tender care for them, if indeed He was willing to give Himself for those who would have stoned Him.

(Hom. in Evang. xiv.) And I lay down My life for My sheep. As if to say, This is why I know My Father, and am known by the Father, because I lay down My life for My sheep; i. e. by My love for My sheep, I show how much I love My Father.

Then because He said above "And the sheep hear his voice, and follow him," lest any should say, "What then is this to those who believe not?" hear what He addeth "And I know My sheep, and am known of Mine." As Paul declared when he said, "God hath not rejected His people whom He foreknew"; and Moses, "The Lord knew those that were His"; "those," He saith, "I mean, whom He foreknew." Then that thou mayest not deem the measure of knowledge to be equal, hear how He setteth the matter right by adding, "I know My sheep, and am known of Mine." But the knowledge is not equal. "Where is it equal?" In the case of the Father and Me, for there, "As the Father knoweth Me, even so know I the Father." Had He not wished to prove this, why should He have added that expression? Because He often ranked Himself among the many, therefore, lest any one should deem that He knew as a man knoweth, He added, "As the Father knoweth Me, even so know I the Father." "I know Him as exactly as He knoweth Me." Wherefore He said, "No man knoweth the Son save the Father, nor the Father save the Son", speaking of a distinct kind of knowledge, and such as no other can possess.