It is my judgment that any man or woman can do more to conform to the laws of God in one year in this life than they could in ten years when they are dead. The spirit only can repent and change, and then the battle has to go forward with the flesh afterwards. It is much easier to overcome and serve the Lord when both flesh and spirit are combined as one. This is the time when men are more pliable and susceptible. We will find when we are dead every desire, every feeling will be greatly intensified. When clay is pliable, it is much easier to change than when it gets hard and sets.
This life is the time to repent. That is why I presume it will take a thousand years after the first resurrection until the last group will be prepared to come forth. It will take them a thousand years to do what it would have taken but three score years and ten to accomplish in this life.
You remember the vision of the redemption of the dead as given to the Church through the late President Joseph F. Smith. President Smith saw the spirits of the righteous dead before their resurrection and the language is the same as one of the Prophet Joseph’s revelations—that they, the righteous dead, looked upon the absence of their spirits from their bodies as a bondage.
I grant you that the righteous dead will be at peace, but I tell you that when we go out of this life, leave this body, we will desire to do many things that we cannot do at all without the body. We will be seriously handicapped, and we will long for the body, we will pray for that early reunion with our bodies. We will know then what advantage it is to have a body… .
The point I have in mind is that we are sentencing ourselves to long periods of bondage, separating our spirits from our bodies, or we are shortening that period, according to the way in which we overcome and master ourselves.
(Melvin J. Ballard, The Three Degrees of Glory, pp. 11–13)