15 I speak, my brethren, regarding the humility of Christ. Who can speak regarding the majesty of Christ, and the divinity of Christ? In explaining and speaking of the humility of Christ, to do so in any fashion we find ourselves not sufficient, indeed wholly insufficient: we commend Him entire to your thoughts, we do not endeavor to fill Him up to your hearing. Consider the humility of Christ. But who, you say, may explain it to us, unless you declare it? Let Him declare it within. Better does He declare it who dwells within, than he who cries without. Let Himself show to you the grace of His humility, who has begun to dwell in your hearts. But now, if in explaining and setting forth His humility we are deficient, who can speak of His majesty? If “the Word made flesh” disturbs us, who shall explain “In the beginning was the Word”? Keep hold then, brethren, upon the entireness of Christ.
16. “The law was given by Moses: grace and truth came by Jesus Christ.” By a servant was the law given, and made men guilty: by an Emperor was pardon given, and delivered the guilty. “The law was given by Moses.” Let not the servant attribute to himself more than was done through him. Chosen to a great ministry as one faithful in his house, but yet a servant, he is able to act according to the law, but cannot release from the guilt of the law. “The law,” then, “was given by Moses: grace and truth came by Jesus Christ.”
Source: Tractates on the Gospel of John (New Advent)