The Quran is comforting the prophet because people harassed him and abused him and despised him for no reason. The Quran is a mercy and guidance. The Quran shows mercy to all, not only to the prophet. God invites everyone to His mercy. God forgives everyone’s sins if they are sincere. Spirituality is not a switch that one can turn off and on. You have to turn away from distractions and anything that sways you away from the remembrance of God, so you will begin to enjoy the connection with God.