Phineas T. Barnum was a legendary figure of the 19th century who was known for his great showmanship, including the Barnum & Bailey Circus.
At one point in time, P.T. Barnum had an exhibition of fierce jungle cats, and all of them lying down together with a single lamb. In a way, it was kind of a preview of the fulfillment of the passage from Isaiah.
When asked how it worked out, Barnum said it was fine, as long as he didn't run out of lambs.
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