John 7:14-20 — Now about the midst of the feast Jesus went up into the temple, and taught.
And the Jews marvelled, saying, How knoweth this man letters, having never learned?
Jesus answered them, and said, My doctrine is not Mine, but His that sent Me.
If any man will do His will, He shall know of the doctrine, whether it be of God, or whether I speak of Myself.
He that speaketh of himself seeketh his own glory: but he that seeketh his glory that sent him, the same is true, and no unrighteousness is in him.
Did not Moses give you the law, and yet none of you keepeth the law? Why go ye about to kill Me?
The people answered and said, Thou hast a devil: who goeth about to kill thee?
Tabernacles lasted seven days.
Teaching was allowed in the outer court of the Temple, the same place Jesus taught when He was a boy.
It was common for different teachers to stand by one of the Temple pillars and teach. We aren't told what Jesus taught this day. Every seven years, the Law was read at the feast of Tabernacles. This may have been that year.
The crowd marveled at Jesus' words, especially since He hadn't been educated. He replied that He hadn't been taught by another, nor was He self-taught. What He taught was from the Father (John 12:49).
"How knoweth this man letters, having never learned?" How like the spirit which is abroad today! How many there are in the educational and religioius world who suppose it is impossible for man to expound the Scriptures gracefully and to the edification of his hearers unless, forsooth, he has first been trained in some college or seminary! Education is an altar which is now thronged by a multitude of idolatrous worshippers. — Exposition of the Gospel of John, by Arthur W. Pink, page 382.
Test 1 — If they did the Father's will, they would have known that what He taught was from the Father.
Test 2 — If a man teaches wisdom from himself, he's just seeking his own glory.
If any man do His will — should be "if any man desires to do His will. Desire = deep-rooted determination
So, to know what Jesus says is really from God, you must determine to yield to God's will.
He informs us how certainty may be arrived at in connection with the things of God,. He tells us how spiritual discernment and assurance are to be obtained. The fundamental condition for obtaining spiritual knowledge is a genuine heart-desire to carry out the revealed will of God in our lives. Wherever the heart is right God gives the capacity to apprehend His truth. — Exposition of the Gospel of John, by Arthur W. Pink, page 385.
The Jews boasted in the law but did not keep it. They sought to kill Him in violation of the law. The people didn't know the leaders wanted to kill Him, so they accused Him of being demon-possessed or insane.
The leaders wanted to kill Jesus because on His previous visit (almost a year earlier) He had healed a man on the Sabbath (John 5:8). They accused Him of breaking the law, but were doing so themselves.
The people blashphemed Jesus while accusing Him of blasphemy!
"My doctrine is not mine." Observe that Christ does not say "My doctrines are not mine," but "My doctrine." The word "doctrine means "teaching," and the teaching (truth) of God is one correlated and complete whole. In writing to Timothy, Paul said, "Take heed unto thyself, and unto the doctrine" (not doctrines — 1 Timothy 4:6). And again he wrote, "All Scripture is given by inspiration of God and is profitable for doctrine" (2 Timothy 3:16). In striking contrast from this, Scripture speaks of "the doctrines of men" (Colossians 2:22); "strange doctrines" (Hebrews 13:9); and "doctrines of demons" (1 Timothy 4:1). Here the word is pluralized because there is no unity or harmony about the teachings of men or the teachings of demons. They are diverse and conflicting. But God's truth is indivisible and harmonious. — Exposition of the Gospel of John, by Arthur W. Pink, page 384-385.