/ · 1894 Brewer’s · S · Samian Letter (The)
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The letter Y, used by Pythagʹoras as an emblem of the straight narrow path of virtue, which is one, but, if once deviated from, the farther the lines are extended the wider becomes the breach.
“When reason doubtful, like the Samian letter,
Points him two ways, the narrower the better.”
Dunciad, iv.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.