Touchstone... Where ignorance is bliss it is folly to be wise ... by Thomas Nast. Cartoon on original page of Harper's Weekly, January 6, 1872.

Caption references New York Mayor Abraham Oakey Hall in quoting Shakespeare's As You Like It:

“ ‘Where Ignorance is Bliss, ‘tis Folly to be Wise.’ I am in Blissful Ignorance of Every Thing that has happened since I have been Mayor of New York.”