change one's stripes/spots, cannot

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change one's stripes/spots, cannot

One cannot alter one’s essential nature. The cliché refers to the tiger, who obviously cannot change its stripes. This in turn is an alteration of a much older saying, an ancient Greek proverb also found in the Bible (“Can the Ethiopian change his skin, or the leopard his spots?” Jeremiah 13:23). The phrase appears in numerous places until the end of the seventeenth century.
See also: cannot, change, stripe