From Henry David Thoreau (1817–1862), American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian.
I did not know that mankind were suffering for want of gold. I have seen a little of it. I know that it is very malleable, but not so malleable as wit. A grain of gold will gild a great surface, but not so much as a grain of wisdom.