I beseech you, in the bowels of Christ, think it possible you may be mistaken. Oliver Cromwell
Even when the experts all agree, they may well be mistaken. Bertrand Russell
Rough diamonds may sometimes be mistaken for worthless pebbles. Thomas Browne
The start of a journey should never be mistaken for success. English Proverb
The spirit that keeps one going when one has no choice of what else to do must not be mistaken for valor. Nigerian Proverb
Listen to the old and you won't be mistaken. Sicilian Proverb