Denotes in the N.T. a spiritual truth that was once hidden but now is revealed, and that, without special revelation, would have remained unknown. It is generally used along with words denoting revelation or publication (e.g., Rom. 16: 25-26; Eph. 1: 9; Eph. 3: 3-10; Col. 1: 26; Col. 4: 3; 1 Tim. 3: 16). The modern meaning of something incomprehensible forms no part of the significance of the word as it occurs in the N.T. See also Alma 12: 9-11; Alma 40: 3; D&C 19: 10; D&C 42: 61-65; D&C 76: 5-10. On the other hand, there is no spiritual gain in idle speculation about things the Lord has not revealed. See Deut. 29: 29; Alma 37: 11.