Heb 6:4 - For it is impossible for those who were once enlightened,… The Syriac and Ethiopic versions render it, “baptized”; and the word is thought to be so used in Heb_10:32. And indeed baptism was called very early “illumination” by the ancients, as by Justin Martyr (i), and Clemens Alexandrinus (k), because only enlightened persons were the proper subjects of it; and the word once here used seems to confirm this sense, since baptism, when rightly administered, was not repeated; but then this sense depends upon an use of a word, which it is not certain did as yet obtain; nor does the apostle take notice of baptism in a parallel place, Heb_10:26. This gave rise to, and seems to favour the error of Novatus, that those who fall into sin after baptism are to be cut off from the communion of the church, and never more to be restored unto it; contrary to the promises of God to returning backsliders, and contrary to facts, as well as to the directions of Christ, and his apostles, to receive and restore such persons; and such a notion tends to set aside the intercession of Christ for fallen believers, and to plunge them into despair: it is better therefore to retain the word “enlightened”, in its proper sense, and to understand it of persons enlightened with Gospel knowledge; there are some who are savingly enlightened by the Spirit of God, to see the impurity of their hearts and actions, and their impotency to perform that which is good, the imperfection of their own righteousness to justify them, their lost state and condition by nature, and to see Christ and salvation by him, and their interest in it; and these being “once” enlightened, never become darkness, or ever so fall as to perish; for if God had a mind to destroy them, he would never have shown them these things, and therefore cannot be the persons designed here; unless we render the words, as the Syriac version does, “it is impossible”----Nwjxy bwtd, “that they should sin again”; so as to die spiritually, lose the grace of God, and stand in need of a new work upon them, which would be impossible to be done: but rather such are meant, who are so enlightened as to see the evil effects of sin, but not the evil that is in sin; to see the good things which come by Christ, but not the goodness that is in Christ; so as to reform externally, but not to be sanctified internally; to have knowledge of the Gospel doctrinally, but not experimentally; yea, to have such light into it, as to be able to preach it to others, and yet be destitute of the grace of God:
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