We should consider heaven as our home (not distant, but present) and while the Kingdom of heaven is coming to earth at the end of all things it is already here and advancing through the community of all believers.
Philippians 3:20-21 But we are citizens of heaven, where the Lord Jesus Christ lives.
Ephesians 2:6 And God raised us up with Christ and seated us with him in the heavenly realms in Christ Jesus
Hebrews 12:22 But you have come to Mount Zion, to the city of the living God, the heavenly Jerusalem. You have come to thousands upon thousands of angels in joyful assembly
Luke 17:21 nor will people say, ‘Here it is,’ or ‘There it is,’ because the kingdom of God is in your midst.”
John 10:9 I am the gate; whoever enters through me will be saved. They will come in and go out, and find pasture.
Matthew 23:13 “Woe to you, teachers of the law and Pharisees, you hypocrites! You shut the door of the kingdom of heaven in people’s faces. You yourselves do not enter, nor will you let those enter who are trying to.