“An Infinite and Eternal Sacrifice”

So this sacrifice must be "infinite" or universal and "eternal" which means it must last forever. Notice, however, that Amulek still has not told us the basic principle on which the Atonement is based. He will gave that to us shortly. Meanwhile he wants to explain who can qualify to make the Atonement. In the first place he wants to stress that no person could pay for the sins of somebody else.

“But It Must Be an Infinite and Eternal Sacrifice”

So this sacrifice must be "infinite" or universal and "eternal" which means it must last forever. Notice, however, that Amulek still has not told us the basic principle on which the Atonement is based. He will gave that to us shortly. Meanwhile he wants to explain who can qualify to make the Atonement. In the first place he wants to stress that no person could pay for the sins of somebody else.