# Irrationality is the square root of all evil by Douglas Hofstadter > "Irrationality is the square root of all evil." > **— Douglas Hofstadter**, *Scientific American / Metamagical Themas (1983)* Verification Status: Unverified — exact wording/source has not yet been independently confirmed against a primary source; source clue: Scientific American / Metamagical Themas (1983).