20And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation:
21Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you(Luke 17:20-21).
The kingdom of God is the Church,which Jesus is the head and we are part of the body.When we receive the Spirit,the kingdom of God is within us,and we are part of the kingdom of God while on earth.
The Bible says the Son shall deliver up the kingdom to the Father,so when Jesus comes for His saints,that is the kingdom.
16The Spirit itself beareth witness with our spirit, that we are the children of God(Romans 8:16).
We will know that we are the children of God,for the Spirit will relate that to us,so we will be assured we are God's children,which Jesus said that He will never leave us or forsake us.If we have the Spirit we will know that we belong to the kingdom.
1Now faith is the substance of things hoped for, the evidence of things not seen(Hebrews 11:1).
If we have true faith,it is the evidence of the kingdom of God that we cannot see,for the Spirit will show us evidence of the invisible kingdom.