What does the Bible say about prayer?

In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God.

Come to me, all you who labor and are heavily burdened, and I will give you rest.

He restores my soul. He guides me in the paths of righteousness for his name’s sake.

For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life.