Joseph F. Smith on Agency

Religion and science have sometimes been in apparent conflict. Yet the conflict should only be apparent, not real, for science should seek truth, and true religion is truth. There can never be conflict between revealed religion and scientific fact. That they have often occupied different fields of truth is a mere detail.

The thing you need to remember about evolution is that the Lord has never revealed anything about the matter. People have their opinions but the Lord has not revealed the details of how He created the Earth.

Every person must decide for himself, on the basis of the evidence produced, which of these three opinions as to the age of the earth, before Adam, seems most reasonable to him, whether (1) six days, or (2) six thousand years, or (3) many millions of years. Clearly it does not matter to one’s daily welfare or ultimate salvation which view he adopts, except that every Latter-day saint must seek and cherish truth above all else.

Jesus had not finished his work when his body was slain, neither did he finish it after his resurrection from the dead; although he had accomplished the purpose for which he then came to the earth, he had not fulfilled all his work. And when will he? Not until he has redeemed and saved every son and daughter of our father Adam that have been or ever will be born upon this earth to the end of time, except the sons of perdition.