The soul is our most essential, fundamental entity. It was realized by God, given to us, and became everlasting. Remain with God and we'll be everlastingly happy. Stray away from him and we'll be everlastingly miserable. Our mind and heart are here to help us discern and make that choice. We should treasure and safeguard our soul, as it is so loved by and so precious to God our Father and creator.