Jesus is the perfect man who, being the fulness of God left his unapproachable Throne of Glory to establish his Throne of Grace for all men, which is his cross. As that perfect man he offered his life to God, his Father, as the perfect sacrafice to pay in full for all sin and take away all the sins of the world, and then offer to all who would believe in him the gift of eternal life. That required both a physical death and a spiritual death, which he accomplished to become the savior of the world.