By St. Theophan the Recluse  
Who
  did not meet the Lord when He, as a king, triumphantly
  entered into Jerusalem; and who did not cry out then,
  "Hosanna to the Son of David!" (Matt. 21:15)? But
  only four days passed, and the same crowd with the same
  tongues cried, "Crucify Him, crucify Him!" (John
  19:6). An amazing change! But why should we be surprised?
  Do we not do the very same thing, when upon receiving the Holy Mysteries of the Body and Blood of the Lord, we
  barely leave the church before forgetting
  everything—both our reverence and God’s mercy
  toward us. We give ourselves over as before to
  self-pleasing deeds—at first small and then also
  large. Perhaps even before four days have passed, although
  we do not cry, “Crucify Him!” we will crucify
  the Lord within ourselves. The Lord sees all of this, and
  suffers. Glory to Thy long-suffering, O Lord!
