Sorry context mattersYes it does mention the Gospel as : The things of the Spirit of God" 1 Cor 2:14
4 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
1 Corinthians 2:6-10 (KJV)
6 Howbeit we speak wisdom among them that are perfect: yet not the wisdom of this world, nor of the princes of this world, that come to nought:
7 But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory:
8 Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory.
9 But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.
10 But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God.
the gospel is not mentioned
The deeper hidden things of God are
The gospel has been revealed
Colossians 1:5-7 (ASV)
5 because of the hope which is laid up for you in the heavens, whereof ye heard before in the word of the truth of the gospel,
6 which is come unto you; even as it is also in all the world bearing fruit and increasing, as it doth in you also, since the day ye heard and knew the grace of God in truth;
7 even as ye learned of Epaphras our beloved fellow-servant, who is a faithful minister of Christ on our behalf,