Hebrews 11:6
No one can please God without faith. Whoever goes to God must believe that God exists and that he rewards those who seek him.
Hebrews 11:1
Faith assures us of things we expect and convinces us of the existence of things we cannot see.
Matthew 17:20
He told them, “Because you have so little faith. I can guarantee this truth: If your faith is the size of a mustard seed, you can say to this mountain, “Move from here to there,” and it will move. Nothing will be impossible for you.”