Matthew 22:36

He said Master tempting Him, for none but a disciple would thus address Christ. Whoever then does not learn of the Word, nor yields himself wholly up to it, yet calls it Master, he is brother to this Pharisee thus tempting Christ. Perhaps while they read the Law before the Saviour's coming, it was a question among them which was the great commandment in it; nor would the Pharisee have asked this, if it had not been long time enquired among themselves, but never found till Jesus came and declared it.

Or he enquires not for the sake of the commands, but which is the first and great commandment, that seeing all that God commands is great, he may have occasion to cavil whatever the answer be.

He who now enquires for the greatest commandment had not observed the least. He only ought to seek for a higher righteousness who has fulfilled the lower.

Again doth the evangelist express the cause, for which they ought to have held their peace, and marks their boldness by this also. How and in what way? Because when those others were put to silence, these again assail Him. For when they ought even for this to hold their peace, they strive to urge further their former endeavors, and put forward the lawyer, not desiring to learn, but making a trial of Him, and ask, "What is the first commandment?" For since the first commandment was this, "Thou shalt love the Lord thy God," thinking that He would afford them some handle, as though He would amend it, for the sake of showing that Himself too was God, they propose the question.