And Jesus answered them, "Have faith in God. Truly, I say to you, whoever says to this mountain, 'Be taken up and cast into the sea,' and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him. Therefore I tell you, whatever you ask in prayer, believe that you have received it, and it will be yours. And whenever you stand praying, forgive, if you have anything against any one; so that your Father also who is in heaven may forgive you your trespasses." Mark 11:22–25 (RSV)
I would have a better chance of physically picking up a mountain and casting it into the sea than relying on my faith to accomplish the wonder.
If I cannot do a simple thing as removing a mountain to the depths of the sea, how then can I begin to imagine I can generate the faith needed to be saved?
If we had anything close to that kind of faith, the nation would be bereft of anything larger than a small hill. We certainly would not need a Savior. We would then face Luther's greatest fear, 'Is the faith I have enough to please God?' An honest soul knows the answer; among us, it is not possible.
I bless the Father that, through the Holy Spirit saving faith, lives within my heart. By the Spirit's ongoing work, day by day, trust in the promises of God are renewed with us all. Thanks be to God, He gives saving faith to all who seek Him.