1 Korintus 2:11

2:11 For who among men knows the things of a man except the man’s spirit within him? So too, no one knows the things of God except the Spirit of God.

1 Korintus 4:9

4:9 For, I think, God has exhibited us apostles last of all, as men condemned to die, because we have become a spectacle to the world, both to angels and to people.

1 Korintus 14:2

14:2 For the one speaking in a tongue does not speak to people but to God, for no one understands; he is speaking mysteries by the Spirit. ¹ 

[14:2]  ¹ tn Or “with the spirit”; cf. vv. 14-16.