"Therefore they were called after this holy order, and were sanctified, and their garments were washed white through the blood of the Lamb."
If you understand these phrases, this verse clarifies the matter.
Being called into this holy order requires a person to be more than a church member, or a follower, or a believer. They need to be "sanctified."
"Their garments were washed white through the blood of the Lamb." No small feat!
To have white garments is to have the blood and sins of your generation removed from you. To be purified. To be sanctified by the Lamb - removing from you, and taking upon Himself the responsibility to answer for whatever failings you have.
This is not ritual purity. This is purity in fact.
The person described by this phrase is qualified to stand in the presence of God without sin. Clean of all blood and sin - righteous forever. He is Christ's, and Christ is the Father's, and all that each of them will be is the same; for we shall see Him as He is, because we will be like Him. To be like Him is to be sanctified.
I can use the words, but I am powerless beyond that. This is more than you think it is. Words are inadequate to explain it. Eye hath not seen, nor ear heard, nor has it entered into the heart of man what great things the Lord has in mind by inheriting these promises. Indeed, to receive an understanding is to cease to be a man and become something else altogether. A stranger and sojourner here, but a resident with God in another condition altogether. It is written by the Lord concerning them: "These are they who are come unto Mount Zion, and unto the city of the living God, the heavenly place, the holiest of all. These are they who have come to an innumerable company of angels, to the general assembly and church of Enoch, and of the Firstborn. These are they whose names are written in heaven, where God and Christ are the judge of all. These are they who are just men made perfect through Jesus the mediator of the new covenant, who wrought out this perfect atonement through the shedding of his own blood." (D&C 76: 66-69.)
Such persons are still in this world, but they are also associated with innumerable others who are not present here. Although mortals associate with each other, these individuals obtain a higher order. They connect with a higher plane, because a more sure word has been spoken to them. As a result they belong to an order of holy priesthood. That priesthood is an order without beginning of days or end of years, from eternity to eternity. This new, higher order, when it occurs can be the spark through which heaven itself can return to the earth.
To others looking in from outside, these are words without meaning, or definition. To those who hold this priestly position, these words are a perfect fit. The gulf between the two positions is so great that even a common vocabulary won't make meanings connect.
We proclaim we "have the truth" but we do not preach it. We claim to have authority, but we have no power to redeem and exalt. We pretend it is unlawful to preach mysteries, yet Alma is preaching the deepest doctrines to the non-converted. If we preach the truth, it will attract those whose lives are empty. Why would they join us if what we offer is as trite and superficial as the false religions they already believe?
Is there no need to cry repentance to this generation with power and authority? With the tongue of an angel? To cry out as the Book of Mormon declares the message to the non-believing and skeptical?
It does raise some troubling concerns as we claim to be the "true church" but do not act the part as shown in these scriptures. How are we justified in masking the fullness, hiding the mysteries, putting away deep doctrine that will save, and still proclaim that we are the "only true and living church upon the earth?" Does "living" require us to create sons and daughters of God who are "come to an innumerable company of angels, to the general assembly and church of Enoch, and of the Firstborn?" If so, why do we hear so little about it in our day?
I suppose our audacity springs from our history? If we have lost something vital that conflicts with our current understanding of the history that GUARANTEES us that we are perfect, and that we cannot be misled, then we wouldn't want to acknowledge that. Thank goodness for these guarantees. It does let us relax a bit, doesn't it? Broad and wide are the guarantees we have inherited. We don't need to worry about that narrow and strait fringe who rummage about in the mysteries.