Determine how strongly sadness is expressed in the following tweet. Use the scale: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.
Tweet: Do not grow weary in doing good. The treadlines are better than deadlines.' @billclinton #CGI2016
0: no sadness can be inferred