Based on the tweet "Psalm 95:1-7 O come, let us sing to the Lord; let us make a joyful noise to the rock of our salvation!", categorize the level of joy felt by the author. Select from the following: 0: no joy can be inferred, 1: low amount of joy can be inferred, 2: moderate amount of joy can be inferred, 3: high amount of joy can be inferred.