Colossians 1:26

“[Even] the mystery which hath been hid from ages and generations, etc.] This is said, as explanative of the word of God; signifying that he did not mean the Scriptures in general, which are the word of God, and every part of them; some part of which is historical, another prophetical, another practical, and another doctrinal; nor the law, which also is the word of God, but the Gospel, called “the mystery”, as it often is; because it contains things, which, though revealed, are mysteries to a natural man; and even to enlightened persons, who have the clearest view of them, the “modus” of them is not to be accounted for; such as the doctrines of the Trinity, of the union of the two natures in…”

“the mystery--(See on Eph 1:9-10; Eph 3:5-9). The mystery, once hidden, now revealed, is redemption for the whole Gentile world, as well as for the Jews, "Christ in you (Gentiles) the hope of glory" (Col 1:27). from ages--"from," according to ALFORD, refers to time, not "hidden from": from the time of the ages; still what is meant is that the mystery was hidden from the beings living in those "ages." The "ages" are the vast successive periods marked by successive orders of beings and stages of creation. Greek, "Æons," a word used by the Gnostics for angelic beings emanating from God. The Spirit by Paul presciently, in opposition to Gnostic error already beginning (Col 2:18), teaches, that…”

“Even the mystery - To make that mystery fully known. See this explained in the notes at Ephesians 3:2-9. The great doctrine that salvation was to be proclaimed to all mankind, Paul says, had been concealed for many generations. Hence, it was called a mystery, or a hidden truth. But now is made manifest to his saints - It was communicated especially to the apostles who were appointed to proclaim it, and through them to all the saints. Paul says that he regarded himself as specially called to make this truth known, as far as possible, to mankind. return to 'Top of Page'”

“The mystery - Namely, Christ both justifying and sanctifying gentiles, as well as Jews. Which hath been comparatively hid from former ages and past generations of men. Colossians 1:27”

“1:26 The concept of a secret, hidden at one time and then revealed, is based upon Jewish apocalyptic ideas. Jewish thinkers conceived of God’s entire plan as already existing in heaven, hidden until God should draw back the curtain and reveal it. The Good News, especially for the Gentiles, had been kept secret until it was revealed in Christ.”

“the mystery: Rom 16:25, Rom 16:26; Co1 2:7; Eph 3:3-10 now: Psa 25:14; Mat 13:11; Mar 4:11; Luk 8:10; Ti2 1:10 Colossians 1:27”