Imaam Ibnul Qayyim (rahimahullaah) said:

”The level of a slave’s (sincerity) in his intention, determination, aim and fervent desire determines Allaah’s Tawfeeq (i.e. Allaah’s guidance for a slave and enabling him to act upon it) and His Aid for him.  Aid and Assistance from Allaah descends upon the slaves in accordance with the (sincerity) in their determination.”

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[Al-Fawaa-id: 181]