20 For the reign of God is not in word but in power.
1 Corinthians 4:20 Cross References - Thomson
Romans 1:16
16 For I am not ashamed of the gospel of the Christ; for it is the power of God for salvation to every one who believeth, to the Jew in the first place, and also to the Greek.
Romans 14:17
17 For the reign of God is not eating and drinking, but righteousness and peace and joy in a holy spirit.
Romans 15:19
19 by virtue of signs and wonders, by the power of the spirit of God; so that from Jerusalem and the country around even to Illyricum, I have confirmed the glad tidings of the Christ,
1 Corinthians 1:24
24 but to them who are called, both Jews and Greeks, Christ the power of God and the wisdom of God;
1 Corinthians 2:4
4 and my discourse and my proclamation was not with persuasive words of human wisdom, but with a demonstration of spirit and power,
2 Corinthians 10:4-5
1 Thessalonians 1:5
5 that our glad tidings did not come to you in word only, but with power, and with a holy spirit, and with much assurance. As you knew what manner of persons we were among you