musterion denotes a matter once concealed or not openly understood, made known through teaching, revelation, or explanation.

The attested use centers on a matter that is concealed, entrusted, disclosed, known, proclaimed, or explained: God makes it known in Ephesians 1:9, it had been concealed and is now revealed in Colossians 1:26, and Revelation 1:20 immediately explains the seven stars and lampstands. The same pattern includes matters of God’s kingdom, Christ, faith, lawlessness, and the future change described in 1 Corinthians 15:51.

1. A concealed matter made known or explained · dominant

   In Ephesians 1:9 the accusative singular occurs in the clause that God “made known” what concerns his will, while Colossians 1:26 describes it as concealed from ages and generations and now revealed. In Matthew 13:11 and Luke 8:10, the accusative plural names what is given to some to know concerning the kingdom, in contrast to others receiving parables. Revelation 1:20 uses the nominative singular before an explanation of the seven stars and seven lampstands, and 1 Corinthians 15:51 introduces the announced change from sleep to being changed.

   Ephesians 1:9Colossians 1:26Matthew 13:11Luke 8:10Revelation 1:201 Corinthians 15:51

In the Anselm Project Bible: Across the supplied verses, the APB regularly presents the term with “mystery” or “mysteries,” including phrases such as “made known,” “concealed,” “revealed,” and “I will say to you.” Because the APB is a whole-verse translation text, those surrounding expressions describe the verse’s presentation rather than fixed renderings of the term alone.