Based on the tweet "'The heart of one person is also cheerful that it may contain the pain of all people.' #francesco #cheerful #love #people #change #God", 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.