I cannot give any scientist of any age better advice than this: the intensity of a conviction that a hypothesis is true has no bearing over whether it is true or not.
Source: In Friendly Advice, ed. Jon Winokur, 1990.
-- Peter Medawar, (Feb 28 1915-1987), English zoologist; He discovered that immunity is acquired in embryo; won Nobel Prize in medicine for work on immunity and skin grafts.