To your God[198] circumcise ye,

Off from your heart with the foreskin!

Lest My wrath break out like the fire,

And burn with none to quench.[199]

Jeremiah has been called the blackest of pessimists, and among his best-known sayings some seem to justify the charge:—

Can the Ethiop change his skin,

Or the leopard his spots?

Then also may ye do good,

Who are wont to do evil.[200]

And again,