Romans 15:19

So Jesus said to him, “Unless you people see signs and wonders, you will never believe.”

Now may the God of hope fill you with all joy and peace in believing, so that you will abound in hope by the power of the Holy Spirit.

for me to be a minister of Christ Jesus to the Gentiles, ministering as a priest the gospel of God, so that my offering of the Gentiles may become acceptable, having been sanctified by the Holy Spirit.

and my word and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power,

The signs of a true apostle were worked out among you with all perseverance, by signs and wonders and miracles.

for our gospel did not come to you in word only, but also in power and in the Holy Spirit and with full assurance; just as you know what kind of men we proved to be among you for your sake.