August 23-29 In this marvelous book of scripture, the Doctrine and Covenants, we learn things that we can know from no other source, including in rich measure the doctrine of pre-mortality, that we lived with Heavenly Parents, before this world was. In this week’s lesson we will explore the purpose of mortality and this, one of the least known doctrines in the world of religion, the reality of a pre-mortal existence.