Music is pleasing not only because of the sound but because of the silence that is in it: without the alternation of sound and silence, there would be no rhythm.  If we strive to be happy by filling the silence of life with sound, productive by turning all life's leisure into work, and real by turning all our being into doing, we will only succeed in producing a hell on earth.  If we have no silence, God is not heard in our music.  If we have no rest, God does not bless our work.  If we twist our lives out of shape in order to fill every corner of them with action and experience, God will seem silently to withdraw from our hearts and leave us empty.