20Notοὐforγὰρinἐνwordλόγῳtheἡkingdomβασιλείατοῦof God [is]θεοῦbutἀλλ’inἐνpowerδυνάμει.
For the kingdom of God [is] not in word but in power.
δυνάμει
δύναμις
might, power, marvelous works