By this we know that we abide in him and he in us, because he has given us of his Spirit.
1 John 4:13

for all have sinned and fall short of the glory of God, being justified freely by His grace through the redemption that is in Christ Jesus,
Romans 3:23-24

John 16:33

“I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world.”

2 Corinthians 4:8–9
We are hard pressed on every side, but not crushed; perplexed, but not in despair; 9 persecuted, but not abandoned; struck down, but not destroyed.

Psalm 51:10

Create in me a pure heart, O God and renew a steadfast spirit within me. NIV