1 Now faith is the substance of things hoped for, the [b]evidence of things not seen.
6 But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.
Hebrews 11:1, 6
20 So Jesus said to them, “Because of your [a]unbelief; for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.
Matthew 17:20