Mark 9:23

23.If thou canst believe. “You ask me,” says he, “to aid you as far as I can; but you will find in me an inexhaustible fountain of power, provided that the faith which you bring be sufficiently large.” Hence may be learned a useful doctrine, which will apply equally to all of us, that it is not the Lord that prevents his benefits from flowing to us in large abundance, but that it must be attributed to the narrowness of our faith, that it comes to us only in drops, and that frequently we do not feel even a drop, because unbelief shuts up our heart. It is an idle exercise of ingenuity to prove Christ’s meaning to be, that a man can believe of himself: for nothing more was intended than to throw back on men the blame of their poverty, whenever they disparage the power of God by their unbelief.

All things are possible to him that believeth. Christ undoubtedly intended to teach that the fullness of all blessings has been given to us by the Father, and that every kind of assistance must be expected from him alone in the same manner as we expect it from the hand of God. “Only exercise,” says he, “a firm belief, and you will obtain.” In what manner faith obtains any thing for us we shall immediately see.