And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.
So then faith [cometh] by hearing, and hearing by the word of God.
For I say, through the grace given unto me, to every man that is among you, not to think [of himself] more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.Hebrews 11:1
Now faith is the substance of things hoped for, the evidence of things not seen.
Hebrews 12:1, 2
Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us, Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.