Dear Mr. Casiopea,
I appreciate your interpretations of first stanza.

One question here. Rabbi Ben Ezra was a Jewish, I suppose his faith was Judaism, while Robert Browning was an English, he was a Christian, wasn't he? So why did Robert Browning use a Jewish mouthpiece to counsel the young on the meaning of life though Rabbi Ben Ezra was well-learned?

And was Rabbi Ben Ezra famous in Europe or Britain during the time of Robert Browning?
And would you please answer my other questions of the second stanza above? I have little questions on the first stanza now.
Thanks again!
Regards,
Flora