Romans 8:9,10.

⁹You, however, are controlled not by the sinful nature but by the Spirit, if the Spirit of God lives in you. And if anyone does not have the Spirit of Christ, he does not belong to Christ. ¹⁰But if Christ is in you, your body is dead because of sin, yet your spirit is alive because of righteousness.

II Corinthians 13:5.

Examine yourselves to see whether you are in the faith; test yourselves. Do you not realize that Christ Jesus is in you--unless, of course, you fail the test?

Colossians 1:27.

To them God has chosen to make known among the Gentiles the glorious riches of this mystery, which is Christ in you, the hope of glory.

John 6:53-57.

⁵³ Jesus said to them, "I tell you the truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. ⁵⁴Whoever eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. ⁵⁵For my flesh is real food and my blood is real drink. ⁵⁶Whoever eats my flesh and drinks my blood remains in me, and I in him. ⁵⁷Just as the living Father sent me and I live because of my Father, so the one who feeds on me will live because of me."

John 15:4-6.

⁴Remain in me, and I will remain in you. No branch can bear fruit by itself; it must remain in the vine. Neither can you bear fruit unless you remain in me. ⁵I am the vine; you are the branches. If a man remains in me and I in him, he will bear much fruit; apart from me you can do nothing. ⁶If anyone does not remain in me, he is like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned.

I John 4 :13.

We know that we live in him and he in us, because he has given us of his Spirit.

Background from Greenfield Graphics.