Nothing short of the shedding of the blood of both an infinite and perfect Being could meet the demands of justice (pay for broken laws) and redeem (exalt) individuals whose progress has been stopped by transgression. No sacrifice of animals or of humans could pay for sins; only an infinite and eternal sacrifice of God himself could do that. Joseph Smith taught: “It must be shedding the blood of the Only Begotten to atone for man, for this was the plan of redemption, and without the shedding of blood was no remission. And as the sacrifice was instituted for a type by which man was to discern the great Sacrifice which God had prepared, to offer a sacrifice contrary to that, no faith could be exercised, because redemption was not purchased in that way… . Certainly, the shedding of the blood of a beast could be beneficial to no man, except it was done in imitation, or as a type, or explanation of what was to be offered through the gift of God Himself—and this performance done with an eye looking forward in faith on the power of that great Sacrifice for a remission of sins.”12
Jesus Christ is an infinite being and can provide immortality and possible redemption for all. There is a vast difference between mere payment and complete redemption (D&C 19:16–19). Ultimately, justice will demand payment for every single sin, whether by the individual or by a proxy, but redemption moves the penitent forward on the path to perfection. The infinite atonement extends to all of the Savior’s worlds (see commentary at 2 Nephi 9:7).