And the Prophet Muhammad (peace and blessings be upon him) said: When any one of you supplicates, he should not say: O Allah, if You will, forgive me; have mercy on me; or provide for me. Rather, he should supplicate with determination and certainty, for there is no one who can compel Allah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8237