Going On unto Perfection (Growth and Maturity in Christ)

Hebrews 5

13 For every one who uses milk (doesn’t refer to one who has just been saved, but rather to those who have been saved for quite some time, and should have advanced in the Word of the Lord) is unskilful in the Word of Righteousness (refers to the benefits of the Cross, from which Righteousness is derived): for he is a babe. (This refers to the individual who does not understand or know all the benefits of what Jesus did at the Cross.)
14 But strong meat belongs to them who are of full age (refers to those mature in the Lord), even those who by reason of use have their senses exercised to discern both good and evil. (Such a person is walking after the Spirit. This refers to placing one’s Faith in the Cross and not after the flesh, the flesh refers to depending on other things [Rom. 8:1–2, 11].)

Hebrews CHAPTER 6
(A.D. 64)

APOSTASY

THEREFORE leaving the Principles of the Doctrine of Christ (speaks of the “first principles,” which refers to the Old Testament; Christ is the Centerpiece of the entirety of the Bible), let us go on unto perfection (speaks of the New Testament Sacrifice, the Lord Jesus, and the Testament He inaugurated with His Work on the Cross); not laying again the Foundation of Repentance from dead works (refers to these Jewish Christians going back to the Old Sacrificial System, etc.), and of Faith toward God (refers to Faith toward God in the realm of the Old Testament Way, which God will not accept now inasmuch as Jesus has fulfilled the Old Testament Law),
2 Of the Doctrine of Baptisms (should have been translated, “the Doctrine of Washings”; this concerned the many “washings” contained in the Old Testament Sacrificial System), and of laying on of hands (goes back to the Levitical Offerings of the Old Testament; when the person brought the animal for Sacrifice, he had to lay his hands on the head of the innocent victim, confessing his sins, thereby transferring them to the innocent animal which would be slain [Lev. 16:21]), and of Resurrection of the dead (refers to Resurrection as taught in the Old Testament; there, this Doctrine was very incomplete, even as all Doctrine in the Old Testament was incomplete; the true meaning could not be given until after the Cross and the Resurrection of Christ, which the Lord gave to Paul [I Cor., Chpt. 15]), and of Eternal Judgment. (In the Old Testament, the Lord was looked at more so as a Judge than anything else. Since the Cross, He is looked at more as the Saviour.)
3 And this will we do (in other words, if we don’t do this [refers to going on to the perfection of Christ], the results will be disastrous), if God permit. (This refers to the fact that all dependence must be in Christ and the Cross. God will not allow any other type of Faith.)
4 For it is impossible for those who were once enlightened (refers to those who have accepted the Light of the Gospel, which means accepting Christ and His great Sacrifice), and have tasted of the Heavenly Gift (pertains to Christ and what He did at the Cross), and were made partakers of the Holy Spirit (which takes place when a person comes to Christ),
5 And have tasted the good Word of God (is not language that is used of an impenitent sinner, as some claim; the unsaved have no relish whatsoever for the Truth of God, and see no beauty in it), and the powers of the world to come (refers to the Work of the Holy Spirit within hearts and lives, which the unsaved cannot have or know),
6 If they shall fall away (should have been translated, “and having fallen away”), to renew them again unto Repentance (“again” states they had once repented, but have now turned their backs on Christ); seeing they crucify to themselves the Son of God afresh (means they no longer believe what Christ did at the Cross, actually concluding Him to be an imposter; the only way any person can truly repent is to place his Faith in Christ and the Cross; if that is denied, there is no Repentance), and put Him to an open shame (means to hold Christ up to public ridicule; Paul wrote this Epistle because some Christian Jews were going back into Judaism, or seriously contemplating doing so).

Swaggart, J. (2005). The Expositor’s Study Bible (pp. 2125–2126). Jimmy Swaggart Ministries.