Being disappointed is one thing and being discouraged is something else. I am disappointed but I am not discouraged.” what do this quote mean

The quote from Tennessee Williams is a good one hunty ;)

Explanation:

 but in my opinion it means you can be disappointed without being discouraged. Disappointed means to be sad or displeased because someone or something has failed to fulfill ones hopes or expectations. Discouraged means to have lost hope or confidence. So I think the quote can be explained by saying although your expectations were not met hope is not lost.