“The pleasure of novelty is by its very nature more subject than any other to the laws of diminishing returns.”

“Knowledge is the only instrument of production that is not subject to diminishing returns”

“The delight we inspire in others has this enchanting peculiarity that, far from being diminished like every other reflection, it returns to us more radiant than ever.”

“The moon does not fight. It attacks no one. It does not worry. It does not try to crush others. It keeps to its course, but by its very nature, it gently influences. What other body could pull an entire ocean from shore to shore? The moon is faithful to its nature and its power is never diminished.”

“Daughters can spend ten percent more than a man can make in any usual occupation. That’s a law of nature, to be known henceforth as ‘Harshaw’s Law.”

“The Law of Diminishing Returns is true of everything in life, except sex, which seems endlessly repeatable with effect.”