For a right understanding of what the Gospels teach concerning the "last things" it is indispensable that the antecedents upon which that teaching was, in the first instance, based should be studied. Eschatology, like so many other things, went through a process of development before it assumed that form which the Gospels have made so familiar to us. No developed growth can be satisfactorily studied without knowing something about its earlier processes of formation and the conditions under which development took place.