The message with which Moses leaves them is simple: you can go on without me, for the Lord is with you.
So too we may have people in our lives upon whom we have relied, in matters spiritual, practical and emotional.
But all things are passing in this world and sooner or later in this life we will be parted from the ones we love and the ones upon whom we have relied.
But God is always with us.
May we go forward and rely on the Lord, drawing ever closer to him in every part of our lives.