And I, when I came to you, brothers, did not come proclaiming to you the testimony of God with lofty speech or wisdom.
2 For I decided to know nothing among you except Jesus Christ and him crucified.
3 And I was with you in weakness and in fear and much trembling,
4 and my speech and my message were not in plausible words of wisdom, but in demonstration of the Spirit and of power,
5 so that your faith might not rest in the wisdom of men but in the power of God.
1 Corinthians 2
As we read this we see that Paul has repeated his emphasised message, that the way people become Christians is by hearing about Christ crucified. Now there is a part that may be misunderstood and that is that part that says “in demonstration of the Spirit and of power.” It sounds a bit like people are converted by seeing something miraculous. But if this is so why did he earlier say in ch1vs22 what he did about Jews seeking signs. No, I believe what he is speaking of is the effect of the one listening to the message. People hear about Christ crucified and God does the rest of the work. When a person becomes a Christian he/she is filled with the Holly Spirit. This would be the demonstration spoken of. Not that I’m not aware that Paul did miracles but that it seems that in this letter Paul is trying to make everyone understand that it is the message of the cross and the power of God that makes people become Christians.