“Yet who would have thought the old man to have had so much blood in him? - Lady Macbeth”
Source: Macbeth
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William Shakespeare 699
English playwright and poet 1564–1616Related quotes

From Albert Einstein and the Cosmic World Order, by C. Lanczos (Wiley, New York, 1956)
Attributed in posthumous publications, Albert Einstein: A guide for the perplexed (1979)
Shakespeare over the Port (1960)

Source: The Tales of Alvin Maker, Red Prophet (1988), Chapter 18.

After the Siege of Drogheda, where Cromwell had forbid his soldiers "to spare any that were in arms in the town" (1649)

Not found in Twain's works, this was attributed to him in Reader's Digest (September 1939): no prior attribution known. Mark Twain’s father died when Twain was eleven years old.
Disputed
Variant: When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years.