Commentaries:
Jamieson, Fausset, and Brown
kingdom of God is not in word—Translate, as in I Corinthians 4:19, to which the reference is "speech." Not empty "speeches," but the manifest "power" of the Spirit attests the presence of "the kingdom of God" (the reign of the Gospel spiritually), in a church or in an individual (compare I Corinthians 2:1, I Corinthians 2:4; I Thessalonians 1:5).
Other Jamieson, Fausset, and Brown entries containing 1 Corinthians 4:20:
Romans 14:17
2 Corinthians 7:11
2 Peter 1:16
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.