The Question and Answer section for Merchant of Venice is a great resource to ask questions, find answers, and discuss the novel.
The above line is spoken by Gratiano, as he lectures Antonio on the need to be happy and enjoy life. In this line, he is practicing what he preaches.... he's off to have a good dinner and will advise his friend another time.
Can you please re-state this? I'm not sure what you are asking here?
According to Gratiano, wise men are silent and stern. They're only considered wise because they don't say anything.