[Luke 17:21 KJV] 21 Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
I couldn't say how many times I have heard it said that this verse shows how the kingdom isn't a literal earthly kingdom, but it is a spiritual kingdom.
Below are a number of verses that speak of entering into the kingdom. Entering into something is a physical, literal action. Jesus spoke of physically entering into a physical, literal kingdom.
[Matthew 5:20 KJV] 20 For I say unto you, That except your righteousness shall exceed [the righteousness] of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
[Mat 7:13, 21 KJV] 13 Enter ye in at the strait gate: for wide [is] the gate, and broad [is] the way, that leadeth to destruction, and many there be which go in thereat: ... 21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
[Mat 18:3 KJV] 3 And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.
[Mat 19:23-24 KJV] 23 Then said Jesus unto his disciples, Verily I say unto you, That a rich man shall hardly enter into the kingdom of heaven. 24 And again I say unto you, It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.
I couldn't say how many times I have heard it said that this verse shows how the kingdom isn't a literal earthly kingdom, but it is a spiritual kingdom.
Below are a number of verses that speak of entering into the kingdom. Entering into something is a physical, literal action. Jesus spoke of physically entering into a physical, literal kingdom.
[Matthew 5:20 KJV] 20 For I say unto you, That except your righteousness shall exceed [the righteousness] of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
[Mat 7:13, 21 KJV] 13 Enter ye in at the strait gate: for wide [is] the gate, and broad [is] the way, that leadeth to destruction, and many there be which go in thereat: ... 21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
[Mat 18:3 KJV] 3 And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.
[Mat 19:23-24 KJV] 23 Then said Jesus unto his disciples, Verily I say unto you, That a rich man shall hardly enter into the kingdom of heaven. 24 And again I say unto you, It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.