And He said to them, “Assuredly, I say to you that there are some standing here who will not taste death till they see the kingdom of God present with power.” (Mark 9:1, NKJV)
When Jesus began preaching the gospel, He said the kingdom of God was near (Mk. 1:14-15). Now, in Mark 9:1, He plainly said the kingdom of God would come (be present) during the lifetime of some who heard Him speak. Although many wish to argue with Jesus over the coming of His kingdom, we will not. Just as Jesus promised, the kingdom of God came with power on Pentecost following His death, resurrection and ascension (read Lk. 24:49; Acts 1:4-5, 8; 2:1-4). His kingdom is His church, to which He adds those being saved (Acts 2:47). Ever since, those converted to Christ by His gospel are delivered from the power of darkness and conveyed “into the kingdom of the Son of His love” (Col. 1:13). This could not happen if the kingdom of God did not yet exist. Since you now know the kingdom of God has come, the crucial question is whether or not you are a citizen of it. Believe and obey the gospel of Christ and you will indeed be a citizen of the kingdom of God (Mk. 16:16; Rev. 1:5-6, 9).