[Mark 4:11 KJV] 11 And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all [these] things are done in parables:
The mystery of the kingdom is not the same mystery revealed to Paul.
Jesus was teaching about the Davidic kingdom on earth, in which, the believing remnant of Israel will reign with Christ for a thousand years.
Some examples of the mystery of the kingdom:
[Matthew 24:45-47 KJV] 45 Who then is a faithful and wise servant, whom his lord hath made ruler over his household, to give them meat in due season? 46 Blessed [is] that servant, whom his lord when he cometh shall find so doing. 47 Verily I say unto you, That he shall make him ruler over all his goods.
What Jesus was revealing was that a faithful servant will be rewarded.
[Matthew 13:44 KJV] 44 Again, the kingdom of heaven is like unto treasure hid in a field; the which when a man hath found, he hideth, and for joy thereof goeth and selleth all that he hath, and buyeth that field.
What Jesus was revealing was that to enter the kingdom they had to sell all they had.
[Matthew 18:23, 32-33 KJV] 23 Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants. ... 32 Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt, because thou desiredst me: 33 Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee?
What Jesus was revealing was for Israel to be forgiven they had to forgive.
The mystery of the kingdom is not the same mystery revealed to Paul.
Jesus was teaching about the Davidic kingdom on earth, in which, the believing remnant of Israel will reign with Christ for a thousand years.
Some examples of the mystery of the kingdom:
[Matthew 24:45-47 KJV] 45 Who then is a faithful and wise servant, whom his lord hath made ruler over his household, to give them meat in due season? 46 Blessed [is] that servant, whom his lord when he cometh shall find so doing. 47 Verily I say unto you, That he shall make him ruler over all his goods.
What Jesus was revealing was that a faithful servant will be rewarded.
[Matthew 13:44 KJV] 44 Again, the kingdom of heaven is like unto treasure hid in a field; the which when a man hath found, he hideth, and for joy thereof goeth and selleth all that he hath, and buyeth that field.
What Jesus was revealing was that to enter the kingdom they had to sell all they had.
[Matthew 18:23, 32-33 KJV] 23 Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants. ... 32 Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt, because thou desiredst me: 33 Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee?
What Jesus was revealing was for Israel to be forgiven they had to forgive.