ΜΥΣΤΉΡΙΟΝ: μυστήριον, -ου, τό [ (< μυέω), [in LXX: Da LXX TH 2:18 ff. (רָז), To 12:7, 11, Jth 2:2, Wi 2:22 6:22 14:15, 23, Si 3:18 22:22 27:16, 17, 21, II Mac 13:21*;] ] 1. . that which is known to the μύστης (initiated), a mystery or secret doctrine, mostly in pl., τὰ μ. (Æsch., Hdt., al.).
2. . In later writers (Menand., Incert., 168), that which may not be revealed (not, however, as in the modern sense, intrinsically difficult to understand), a secret or mystery of any kind (To 12:7, 11, Jth 2:2, II Mac 13:21).
3. . In NT, of the counsels of God (cf. Th.: Jb 15:8, Ps 24 (25):14 for סוֹד), once hidden but now revealed in the Gospel or some fact thereof; (a) . of the Christian revelation generally: Ro 16:25, I Co 2:7, Col 1:26, 27, Eph 3:3, 9; τ. βασιλείας τ. θεοῦ, Mk 4:11; τ. θεοῦ, I Co 2:1, Re 10:7; τ. θ., Χριστοῦ, Col 2:2; τ. Χριστοῦ, Col 4:3, Eph 3:4; τ. θελήματος αὐτοῦ, Eph 1:9; τ. εὐαγγελίου, Eph 6:19; τ. πίστεως, I Ti 3:9; τ. εὐσεβείας, I Ti 3:16; (b) . of particular truths, or details, of the Christian revelation: Ro 11:25, I Co 15:51, Eph 5:32, II Th 2:7, Re 1:20 17:5, 7; pl., τὰ μ., I Co 13:2 14:2; θεοῦ, I Co 4:1; τ. βασιλείας τ. οὐρανῶν (θεοῦ), Mt 13:11, Lk 8:10 (cf. Westc., Eph., 180 ff.; AR, Eph., 234 ff.; Lft., Col., 165 f.; Hatch, Essays, 57 f.; DB, iii, 465 ff.; DCG, ii, 213 ff.).†