So also Christ glorified not himself to be made an high priest; but he that said unto him, Thou art my Son, to day have I begotten thee. As he saith also in another place, Thou art a priest for ever after the order of Melchisedec.
Christ was name Melchisedec while in human form.
He first appeared to bless Abram after the slaughter of the kings.
Abraham knew it was the Lord, when He came with two others to spy out Sodom. How did He know? Because he had seen Him before after the slaughter of the kings.
Jacob did not know who He was that he wrestled with, because he had not seen Him as His father Abraham had: Melchisedec.
When the God of Israel was become flesh, then He was no longer called Melchisedec but Jesus, who is made after the days of His flesh Melchisedec in heaven, an high priest forever after His order.
Melchisedec wrestled with Jacob, that he might bless him. Christ wrestled with Jacob, to teach him the fear of the Lord: to know that it is not by might, nor by power nor by will of man, but by the Spirit of the Lord, that we have power with God.
Jacob learned in a no-win wrestling match with the Lord in form of man, that there was someone he could not outwit, out-play, nor over-power by the flesh, and so he was named Israel, having power with God to prevail. Not to prevail over the Lord, but to learn to prevail over himself, and to trust only in the Lord by faith.
When Melchisedec became flesh, to be a man made of a woman, He also learned obedience, as did Jacob, in a no-win wrestling match with the Father, who would never consent to disannulling His commandment to His Son to lay down His life for man on the cross.
Jesus as a man, made of flesh according to the seed of David, learned the same obedience as Jacob in that night in Gethsemane: though the infirmity of flesh is weak, yet the spirit is willing, therefore we are to follow after the Spirit in obedience to God, and not give in to the weakness of the flesh.
Melchisedec in the form of a man, later named Jesus in the flesh, learned the obedience of Jacob, which opportunity was provided to him by wrestling all the night through: There is no overcoming God, as Adam might have supposed, but in Christ there is only overcoming our own flesh in obedience to the Father, which we have by the faith of Jesus, the Son of God, made an high priest after the order of Melchisedec, being made perfect through the things which He suffered, and so became the Author of eternal salvation for all them that learn to obey Him, even as He learned to obey the Father, despite the weak infirmity of His flesh.
The lesson Jesus learned in the garden, was the lesson He taught as Melchisedec to Jacob on the plain of Mahanaim:
Not by might, nor by power, but by my spirit, saith the LORD of hosts.
I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.
For ye see your calling, brethren, how that not many wise men after the flesh, not many mighty, not many noble, are called: But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty; And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are: That no flesh should glory in his presence.
God is not looking for the mighty in knowledge and skill, nor to them in understanding of all mysteries, but only to them that will purify their hearts, even as He is pure, by the same faith of obedience of Jesus unto the cross,and so be counted worthy to inhabit immortality in spiritual bodies.
We are the children of Abraham by the faith of Jesus in the heart, and we are the children of Israel by obeying Him from the heart.
Only them that learn obedience to the faith, as did Jacob all night long, and as did Jesus in the night, will inherit eternal salvation in the resurrection of the church unto eternal life. without shame.