John Gill

And all things whatsoever,.... Not only miracles, but any other thing which may be for the honour of God, the interest of religion, the spreading of the Gospel, the enlargement of the kingdom, of Christ, their own spiritual good, and the welfare of immortal souls, ye shall ask in prayer, believing. Munster's Hebrew Gospel reads it, "in prayer, and in faith"; and the Arabic version renders it, "in prayer with faith"; both to the same purpose, and aptly express the sense of the words, which design the prayer of faith; or that prayer which is put up in the strength of faith; and is of great avail with God: for whatever is asked in faith, agreeable to the will of God, which is contained in his covenant, word, and promises, and makes for his glory, and the good of his people, shall be given, be it what it will; though to carnal sense and reason it may seem impracticable and impossible: ye shall receive; of God, through Christ, freely and fully, and shall have and enjoy them, either they themselves, if asked for themselves, or others, for whom they are asked.