The most wilfully foolish man cannot stand aloof from his folly, but the deed and the doer together make ever one sober fact.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“but it is certain, that that which alone we can call Persius, which is forever independent and consistent, was in earnest, and so sanctions the sober consideration of all. The artist and his work are not to be separated. The most wilfully foolish man cannot stand aloof from his folly, but the deed and the doer together make ever one sober fact. There is but one stage for the peasant and the actor. The buffoon cannot bribe you to laugh always at his grimaces; they shall sculpture themselves in Egyptian granite, to stand heavy as the pyramids on the ground of his character.” source