Who said a little knowledge is a dangerous thing?

Alexander Pope (1688 - 1744) wrote 'An Essay on Criticism' in 1709. In it he wrote:

"A little learning is a dangerous thing; drink deep, or taste not the Pierian spring: there shallow draughts intoxicate the brain, and drinking largely sobers us again." The modern meaning translates to mean that people with a small amount of knowledge often think that they have more 'expertise' than they really do. Sometimes, when this percieved 'expertise' translates into action, it can result in unpredictable, or even tragic consequences.