Perseverance is the most overrated of traits, if it is unaccompanied by talent; beating your head against a wall is more likely to produce a concussion in the head than a hole in the wall.
Source: In Instant Quotation Dictionary, by Donald O. Bolander, 1979.
-- Sydney J Harris, (Sep 14 1917-1986), US journalist, author; He wrote a syndicated column, Strictly Personal, from 1944-86.