Rav Hirsch On VeHu Rachum Before Maariv

"When at night, which for us marks the start of a new day, we look back in retrospect upon what we have done during the day that has just passed, we are filled with a crushing sense of inadequacy, and only the thought of G-d's compassion in which he has so often granted us atonement in the past can sustain us." Hirsch Siddur pages 533-534