The line " This is Dear mercy, and thous seest it not" this lines depicts according to Friar, that the punishment was a type of mercy and he should be grateful.
The lines from act III, scene III of Romeo and Juliet is one that Friar Laurence makes Romeo to understand that he had to be grateful for this punishment given to him
When Romeo knows about his punishment for his act of killing Tybalt and that it was banishment, he informs Friar Lawrence that he prefer death than been banished but Frair made him to see reasons why it was better.
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