Poison is in everything, and no thing is without poison. The dosage makes it either a poison or a remedy.
Source: In The Speaker's Electronic Reference Collection, AApex Software, 1994.
-- Philipus Aureolus Paracelsus, (Nov 11 1493-1541), German-Swiss physician; He established the role of chemistry in medicine; published Die grosse Wundartzney (Great Surgery...).