Deep within himself, man longs for a better and longer-lasting life. This deep longing reveals both the ephemeral nature of our material existence and the eternal nature of our spiritual existence, which Jesus Christ has both confirmed and demonstrated. Such an eternal life does truly exist, and Jesus has the power to lead man to it. In fact, it is to this that Jesus invites all of humanity, without distinction, without exception. He offers it to all human beings as SALVATION that comes through him, and in virtue of which all human beings become brothers and sisters to one another through him. This book is an attempt to examine how essential the brotherhood of all humankind is to the achievement of the better life that Christ promises and actually demonstrates in himself.