For verily I say unto you, that many prophets and righteous men desired to see the things which ye see, and saw them not; and to hear the things which ye hear, and heard them not.

Matthew 13:17 ASV

Here, as in Matthew 13:11, Christ referred to the hidden nature of God’s eternal purpose for man’s salvation. Paul frequently wrote of this, and a more particular attention to that “mystery” can be quite rewarding.

The New Testament refers to these mysteries:

The mystery of Christ and his church (Ephesians 6:32)

The mystery of lawlessness (2 Thessalonians 2:7)

The mystery of the seven stars and seven candlesticks (Revelation 1:20)

The mystery of the resurrection (1 Corinthians 15:51)

The mystery of the blindness of Israel (Romans 11:25)

The mystery of the harlot church (Revelation 14:7)

The mysteries of the kingdom of heaven (Matthew 13)

Containing all those mysteries, and exceeding them, is a greater and more comprehensive mystery referred to by Paul as:

The great mystery (1 Timothy 3:16)
The mystery (Romans 16:25)

The mystery of his will (Ephesians 1:9)

The mystery of Christ (Ephesians 3:4)

The mystery of the gospel (Ephesians 6:19)

The mystery of God (Colossians 2:3)

The mystery of faith (1 Timothy 3:9)

The mystery of godliness (1 Timothy 3:16)

Peter also elaborated the fact that the ancient prophets, and even the angels of God, desired to “look into” those things which they could not fully understand (1 Peter 1:10-12).

In view of such things, how blessed indeed were the disciples of the Lord who were privileged in him to see the embodiment of the total mystery of redemption. Neither men nor angels knew it until Christ revealed it to the Twelve.

Now I rejoice in my sufferings for your sake, and in my flesh I complete what is lacking in Christ’s afflictions for the sake of his body, that is, the church, of which I became a minister according to the divine office which was given to me for you, to make the word of God fully known, the mystery hidden for ages and generations but now made manifest to his saints.
Colossians 1:24‭-‬26 RSV

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