Task: Categorize the tweet based on the intensity of the specified emotion E, capturing the tweeter's mental state. 0: no E can be inferred. 1: low amount of E can be inferred. 2: moderate amount of E can be inferred. 3: high amount of E can be inferred.
Tweet: A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty. \n― Winston S. Churchill #quote
Emotion: sadness
Intensity class: 
0: no sadness can be inferred