You say that God became incarnate because of "His concern for our life after this world". But the Church teaches that God became incarnate also so that we might know His love; so that we might take Him as our model of holiness; and so that we might become partakers of His divine nature. In all these ways, the message and the importance is for our life in this world. If we understand and accept the message, then "our life after this world" will take care of itself.
Our Lord came so that we "may have life and have it to the full" [John 10:10]. So Loy's "less sorrowful" seems right, although I am not sure if it is indeed a quotation from St John XXIII.