And again, it shall come to pass that he that hath faith in me to be healed, and is not appointed unto death, shall be healed. He who hath faith to see shall see. He who hath faith to hear shall hear. The lame who hath faith to leap shall leap. And they who have not faith to do these things, but believe in me, have power to become my sons; and inasmuch as they break not my laws thou shalt bear their infirmities.Notice that the first sentence says "he that hath faith in me". There is an important distinction between simply having faith, and having faith in Jesus Christ. Many people have "faith". They believe that the sun will come up in the morning. That their stock will go up. That a newly formed marriage will succeed. Faith gets us out of bed in the morning.
It is faith which impels us to action, and all people have it in different amounts and directed toward different things. However, when we assume to have faith in the supernatural, in miracles, faith in Jesus Christ is "the only name whereby salvation cometh", and wherein there is true righteous power. If our faith is not in Jesus Christ, and is not confirmed by His holy will, the thing that we have faith in is not guaranteed, and in fact, may be unrighteous.
Jesus told us:
Thus, not believing in things which have been revealed, and believing in things which have not been revealed are both non-conformant to the Spirit, and are forms of unbelief and idolatry.And truth is knowledge of things as they are, and as they were, and as they are to come; And whatsoever is more or less than this is the spirit of that wicked one who was a liar from the beginning. (D&C 93:24,25)
Now, I say this with the caveat that hope and belief are different things. One may hope for something good without a knowledge of whether it is in accordance with His will. But when one begins to believe something without ascertaining the will of God, he's treading on thin ice.
All miracles are granted to those of faith whenever it is according to His will:
And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover. (Mark 16:17-18)I assert that the true church or people of God will have these and all other miracles among them. Many say that the day of miracles have ceased, but if that were so, why does the Bible not say so? And, why is the Bible so chock full of miracles? Isn't it so that we will believe in them? It is easy for us to doubt things we have not experienced for ourselves. But just because we haven't seen any of these things does not mean that they do not exist. If we don't experience miracles, it is usually due to a lack of faith.
And now, O all ye that have imagined up unto yourselves a god who can do no miracles, ... God has not ceased to be a God of miracles.Besides lack of faith and the will of God, another possible reason we may experience fewer miracles, or at least smaller ones, is that our circumstances may not warrant big miracles. Now I'm talking about the parting of the Red Sea, the submission of lions, fire from heaven, etc. For the majority of us, I think that our lives are not in danger most of the time and thus we don't need divine intervention to save our lives on a daily basis. I'm not saying that divine intervention doesn't occur on a daily basis, even to save our lives, but that it happens more subtly and in smaller degrees; to the extent that unless we are careful, we may not notice it.
And who shall say that Jesus Christ did not do many mighty miracles? And there were many mighty miracles wrought by the hands of the apostles. And if there were miracles wrought then, why has God ceased to be a God of miracles and yet be an unchangeable Being? And behold, I say unto you he changeth not; if so he would cease to be God; and he ceaseth not to be God, and is a God of miracles. And the reason why he ceaseth to do miracles among the children of men is because that they dwindle in unbelief, and depart from the right way, and know not the God in whom they should trust. Behold, I say unto you that whoso believeth in Christ, doubting nothing, whatsoever he shall ask the Father in the name of Christ it shall be granted him; and this promise is unto all, even unto the ends of the earth. (Mormon 9:15,18-21)
... behold I say unto you, that by small and simple things are great things brought to pass; and small means in many instances doth confound the wise. And the Lord God doth work by means to bring about his great and eternal purposes; and by very small means the Lord doth confound the wise and bringeth about the salvation of many souls. (Alma 37:6-7)I also want to address the final sentence of the topic scripture: "And they who have not faith to do these things, but believe in me, have power to become my sons; and inasmuch as they break not my laws thou shalt bear their infirmities."
Concerning faith to be healed, etc. many of us may not have sufficient faith. Or as was pointed out by Elder Bednar, "faith not to be healed" may be required; meaning the humility to accept that a trial in our life may have been put there in for a wise purpose in God, which we may not understand. Regardless, whether a particular miracle of healing or otherwise is granted, if they "believe in me" they "have power to become my sons". This is really the important part.
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. (John 3:16)When all things are considered, we realize that salvation is infinitely more important than survival. Thus accepting the will of God to grant or not grant miracles as His wisdom sees fit, is ultimately the best, because this life is a temporary step onto bigger and greater things. And it will be great, if we believe in Him.