I write to you, little children, because your sins are forgiven you for his name's sake.

 The last hour does not mean a time of annihilation whose end will be a great nothingness as there was at the beginning. In biblical thought the last time is the end of one age and the beginning of another. It is last in the sense that things as they are pass away; but it leads not to world obliteration but to world re-creation. 