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On being asked the meaning of the expression: "la hawla wala quwwata illa bi'llah " (there is no strength nor power but by means of Allah). Amir al-mu'minin, peace be upon him, said : We are not master of anything along with Allah, and we are not master of anything save what He makes us master of. So, when lie makes us master of anything of which lie is a superior Master over us He also assigns some duties to us; and when lie takes it away He will take away those duties as well.
— ALI IBN ABI TALIB