Roma 15:19

15:19 in the power of signs and wonders, in the power of the Spirit of God. So from Jerusalem even as far as Illyricum I have fully preached the gospel of Christ.

Roma 15:1

Exhortation for the Strong to Help the Weak

15:1 But we who are strong ought to bear with the failings of the weak, and not just please ourselves. ¹ 

1 Korintus 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,

[15:1]  ¹ tn Grk “and not please ourselves.” NT Greek negatives used in contrast like this are often not absolute, but relative: “not so much one as the other.”