2 Kings 6:16-17. ESV
V16.He said, Do not be afraid, for those who are with us are more than those who are with them.
V17.Then Elisha prayed and said, O Lord, please open his eyes that he may see. So the Lord opened the eyes of the young man, and he saw, and behold, the mountain was full of horses and chariots of fire all around Elisha.
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Matthew 11:11
Truly, I say to you, among those born of women there has arisen no one greater than John the Baptist. Yet the one who is least in the kingdom of heaven is greater than he.
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Jesus is saying those who are in the kingdom of heaven under the New Covenant, are greater than every prophets in Old Covenant or Old Testament.

Why? Because we are born again, sealed with the Holy Spirit inside – who will never leave us.
Why? We are clothed with power from on high (Acts1:8).
Why ? The enemies has been disarmed 2000 yrs ago.(Col2:15)
Why? We hv authority over the power of the enemy , evil spirits are subjected to us (Luke10:19-20)
But why are some christians not rcvd the fullness of the kingdom?
2 reasons:
Lack of knowledge (Not reading His Word) (Hosea 4:6) &
Disbelief – which canceled out the abiding faith already existed inside us.

Ephesian 2:8 – by grace thru faith we are saved (sozo – Healed, delivered, total restoration) . Grace of healing, salvation, deliverance was given 2000 yrs ago, all we need is faith. The Lord already deposited faith inside us (fruit of HS in Gal5:22-23), but if we hv unbeliefs (wrong teachings, faulty thinking about how powerful the enemy is, strongholds) , it will canceled out the faith.
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Matthew 17:20 NKJV
So Jesus said to them, “Because of your unbelief; for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.