The writer to the Hebrews writes in the 11th chapter, Faith is the substance of things hoped for, the evidence of things not seen. For by it the elders obtained a good testimony. By faith we understand that the worlds were framed by the word of God, so that the things which are seen were not made of things which are visible.
Just a later, he writes Without faith it is impossible to please Him (that is, God), for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him (Hebrews 11:1-2, 6)
St. James writes in his epistle, the first chapter, If any of you lacks wisdom, let him ask of God, who gives to all liberally and without reproach, and it will be given to him. But let him ask in faith, with no doubting, for he who doubts is like a wave of the sea driven and tossed by the wind. For let not that man suppose that he will receive anything from the Lord; he is a double-minded man, unstable in all his ways (James 1:5-8).
Not least of all, our Lord Jesus says, Whoever lives and believes in Me shall never die (John 11:26).
To a woman who came to Jesus with her sin and sought His mercy, He says, Your faith has saved you. Go in peace (Luke 7:50).
In today’s text, Jesus says, If you have faith like a grain of mustard seed,you could say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it would obey you.