μυστήριον, 
μυστηρίου, 
τό (
μύστης (one initiated; from 
μυέω, which see)), in classical Greek 
a hidden thing, secret, mystery: 
μυστήριον σου μή κατειπης τῷ φιλῶ, 
Menander; plural generally 
mysteries, religious secrets, confided only to the initiated and not to be communicated by them to ordinary mortals; (cf. K. F. Hermann, Gottesdienstl. Alterthümer der Griechen, § 32). In the Scriptures: 
1. a hidden or secret thing, not obvious to the understanding: 
1 Corinthians 13:2; 
1 Corinthians 14:2; (of the secret rites of the Gentiles, Wis. 14:15, 23). 
2. a hidden purpose or counsel; secret will: of men, 
τοῦ βασιλέως, Tobit 12:7, 11; 
τῆς βουλῆς αὐτοῦ, Judith 2:2; of God: 
μυστήρια Θεοῦ, the secret counsels which govern God in dealing with the righteous, which are hidden from ungodly and wicked men but plain to the godly, Wis. 2:22. In the N. T., God's plan of providing salvation for men through Christ, which was once hidden but now is revealed: 
Romans 16:25; 
1 Corinthians 2:7 (on this see 
ἐν, I. 5 f.); 
Ephesians 3:9; 
Colossians 1:26f; with 
τοῦ θελήματος αὐτοῦ added, 
Ephesians 1:9; 
τοῦ Θεοῦ, which God formed, 
Colossians 2:2; (
1 Corinthians 2:1 WH text); 
τοῦ Χριστοῦ, respecting Christ, 
Colossians 4:3; 
τοῦ εὐαγγελίου, which is contained and announced in the gospel, 
Ephesians 6:19; 
ἐτελέσθη τό μυστήριον τοῦ Θεοῦ, said of the consummation of this purpose, to be looked for when Christ returns, 
Revelation 10:7; 
τά μυστήρια τῆς βασιλείας τῶν οὐρανῶν or 
τοῦ Θεοῦ, the secret purposes relative to the kingdom of God, 
Matthew 13:11; 
Mark 4:11; 
Luke 8:10; used of certain single events decreed by God having reference to his kingdom or the salvation of men, 
Romans 11:25; 
1 Corinthians 15:51; of God's purpose to bless the Gentiles also with salvation through Christ (cf. 
Lightfoot on 
Colossians 1:26), 
Ephesians 3:3, cf. 
Ephesians 3:5; with 
τοῦ Χριστοῦ added, 
Ephesians 3:4; 
οἰκονόμοι μυστηρίων Θεοῦ, the stewards of God's mysteries, i. e. those intrusted with the announcement of God's secret purposes to men, 
1 Corinthians 4:1; used generally, of Christian truth as hidden from ungodly men: with the addition of 
τῆς πίστεως, 
τῆς εὐσεβείας, which faith and godliness embrace and keep, 
1 Timothy 3:9, 
16; 
τό μυστήριον τῆς ἀνομίας the mystery of lawlessness, the secret purpose formed by lawlessness, seems to be a tacit antithesis to God's saving purpose, 
2 Thessalonians 2:7. 
3. Like 
רָזָא and 
סוד in rabbinic writers, it denotes 
the mystic or hidden sense: of an O. T. saying, 
Ephesians 5:32; of a name, 
Revelation 17:5; of an image or form seen in a vision, 
Revelation 1:20; 
Revelation 17:5; of a dream, (
Theod.) 
Daniel 2:18f, 
27-30, where the 
Sept. so renders 
רָז. (The 
Vulg. translates the word
sacramentum in 
Daniel 2:18; 
Daniel 4:6; Tobit 12:7; Wis. 2:22; 
Ephesians 1:9; 
Ephesians 3:3, 
9; 
Ephesians 5:32; 
1 Timothy 3:16; 
Revelation 1:20.) (On the distinctive N. T. use of the word cf. Campbell, Dissertations on the Gospels. diss. ix. part i.; Kendrick in 
B. D. American edition under the word ; 
Lightfoot on 
Colossians 1:26.) 
    THAYER’S GREEK LEXICON, Electronic Database.
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BLB Scripture Index of Thayer's