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Do not dispute with anyone in any matter as far as possible. For in argumentation lies much harm and its evil is greater than its benefit. – Al-Ghazali
He that always gives way to others will end in having no principles of his own. – Aesop
It pays to be prepared. – Aesop
Remember that it is not enough to abstain from lying by word of mouth; for the worst lies are often conveyed by a false look, smile, or act. – Abraham Cahan