1 Corinthians 2:4

2:4 My conversation and my preaching were not with persuasive words of wisdom, but with a demonstration of the Spirit and of power,

1 Corinthians 9:24

9:24 Do you not know that all the runners in a stadium compete, but only one receives the prize? So run to win.

14:12 It is the same with you. Since you are eager for manifestations of the Spirit,¹ seek to abound in order to strengthen the church.

15:2 and by which you are being saved, if you hold firmly to the message I preached to you – unless you believed in vain.

15:34 Sober up as you should, and stop sinning! For some have no knowledge of God – I say this to your shame!

¹tn Grk “eager for spirits.” The plural is probably a shorthand for the Spirit’s gifts, especially in this context, tongues.