"Ha! Boulton," said the king. "It is long since we have seen you at court. Pray, what business are you now engaged in?" "I am engaged, your Majesty, in the production of a commodity which is the desire of kings." "And what is that? What is that?" "POWER, your majesty!"

In: Ralph Stein, The Great Inventions, The Steam Engine (p. 24)