What has God made known to us?

I was looking at Eph 6:19, the greek word made known

Pray in the Spirit at all times, with every kind of prayer and petition. To this end, stay alert with all perseverance in your prayers for all the saints. Pray also for me, that whenever I open my mouth, words may be given me so that I will boldly make known the mystery of the gospel, for which I am an ambassador in chains. Pray that I may proclaim it fearlessly, as I should (Eph 6:18-20)

The Mystery of God's Redemptive Plan — this is by far the dominant subject, especially in Paul's letters. Ephesians alone hits it four times: the mystery of God's will (Eph 1:9), the mystery revealed by revelation (Eph 3:3), the mystery hidden from prior generations (Eph 3:5), and the mystery of the gospel (Eph 6:19). Colossians 1:27 ties it to "Christ in you, the hope of glory," and Romans 16:26 describes the mystery now disclosed to all nations.

God's Own Attributes — His power and wrath (Rom 9:22–23), the riches of His glory (Rom 9:23), His grace (2 Cor 8:1), and His manifold wisdom made known to heavenly rulers through the church (Eph 3:10).

The Father's Name and Character — Jesus declares in John 17:26 that he has made the Father's name known and will continue to do so, connecting to John 15:15 where he says he's disclosed everything from the Father to the disciples.

The Gospel itself — 1 Cor 15:1 and Gal 1:11 use gnōrizō for the gospel's content and origin (not from human beings).

Christ's power and coming — 2 Pet 1:16, explicitly distinguishing eyewitness proclamation from myth.

Mundane/practical uses — Tychicus making Paul's circumstances known (Eph 6:21, Col 4:7, 4:9), requests made known to God (Phil 4:6), and Paul saying he doesn't know which to choose (Phil 1:22).

The theological weight of the word clearly falls on divine disclosure of what was previously hidden — particularly "the mystery," a technical term in Paul for God's plan to unite Jews and Gentiles in Christ, kept secret for ages but now actively being revealed through proclamation.