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صديق كل امرء عقله و عدوه جهله
دوست هركس عقل او, و دشمنش جهل اوست
امام رضا(درود خدا بر او باد)، اصول كافى,ج 4

Freind anyone is his intellect, and his enemy, his ignorance.
Eighth Shiie Imam, Osool kafi 

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