It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult.
Source: In Pearls of Wisdom, ed. J. Agel and W. Glanze, 1987.
-- Lucius Annaeus Seneca, ( 4 BC-65AD), Roman philospher, statesman; He was a famed stoic who wrote eight tragedies; committed suicide at Nero's command.