"Except a man and his wife enter into an everlasting covenant and be married for eternity while in this probation, by the power and authority of the holy priesthood, they will cease to increase when they die; that is, they will not have any children after the resurrection. But those who are married by the power and authority of the priesthood in this life, and continue without committing the sin against the Holy Ghost, will continue to increase and have children in the celestial glory. * * * In the celestial glory there are three degrees or heavens, and in order to obtain the highest, a man must enter into this order of the priesthood, and if he does not, he cannot obtain it. He may enter into the other, but that is the end of his kingdom; he cannot have an increase."--Quoted in Young Men's Improvement Manual from Joseph Smith, Mill. Star, page 108. "I wish to be perfectly understood here. Let it be remembered that the Prophet Joseph Smith taught that man, that is his spirit, is the offspring of Deity; not in any mythical sense, but actually. * * * Instead of the God-given power of procreation being one of the chief things that is to pass away, it is one of the chief means of man's exaltation and glory in that great eternity which like an endless vista stretches out before him. * * * Through that law, in connection with an observance of all the other laws of the Gospel, man will yet attain unto the power of the God-head, and like his Father--God--his chief glory will be to bring to pass the eternal life and happiness of his posterity."--Roberts, New Witness for God, page 461. "The devil and his angels having forfeited in their first estate all right to enter a second with bodies of flesh and bones, and having lost the privilege of marrying and propagating their species, feel maliciously wicked and envious against the sons of men who kept their first estate and now are in the enjoyment of the second, marrying and increasing their families or kingdoms."--Orson Pratt in The Seer, page 79.