And I will ask the Father, and he will give you another Helper, to be with you forever, even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him. You know him, for he dwells with you and will be in you.

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John 14:16-17

Enter his gates with thanksgiving, and his courts with praise! Give thanks to him; bless his name! For the LORD is good; his steadfast love endures forever, and his faithfulness to all generations.

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Psalm 100:4-5

At that time the disciples came to Jesus, saying, “Who is the greatest in the kingdom of heaven?” And calling to him a child, he put him in the midst of them and said, “Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven.

The rest is here: 
Matthew 18:1-4