Brigham Young promises faithful women that they will becomes mothers in the hereafter and become a "Mother Eve."
Brigham Young, "Source of Intelligence—Laws of The Gospel, &c.," Journal of Discourses, 26 vols. (Liverpool: George Q. Cannon, 1861), 8:208
Let me here say a word to console the feelings and hearts of all who belong to this Church. Many of the sisters grieve because they are not blessed with offspring. You will see the time when you will have millions of children around you. If you are faithful to your covenants, you will be mothers of nations. You will become Eves to earths like this; and when you have assisted in peopling one earth, there are millions of earths still in the course of creation. And when they have endured a thousand million times longer than this earth, it is only as it were the beginning of your creations. Be faithful, and if you are not blest with children in this time, you will be hereafter. But I would not dare tell you all I know about these matters, though I know but little: still I am not a fool in the things of God, neither is brother Taylor, though he saw so much to learn that he did not realize that he had learned anything. We have learned a great deal, although we are still but babes and sucklings in the things of God; yet the truth and knowledge we possess pertaining to the plan of salvation outweigh all possessed by others on the earth. Be faithful, and you will delight in the things of God, and bear the yoke—carry the burden God has placed on you to bear.