The most secret abandon
 
Gelassenheit fäh’t Gott;
  Abandonment          seizes  God;  [Gelassenheit = the state of letting something/someone be]
     Gott aber selbst zu lassen,
         God     however   himself to    let be,
Ist ein Gelassenheit,
  Is   an        abandonment,
     die wenig Menschen fassen.
          that     few         men                    grasp.  [wenig is adverbial: to a small degree]