Determine how strongly joy is expressed in the following tweet. Use the scale: 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.
Tweet: Optimism leads to success. - Bill Kerr @Coach__Kerr #success  #goals
2: moderate amount of joy can be inferred