It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: When any one of you makes supplication, he should not say: O Allah! If You wish, forgive me; rather, he should pray with determination and certainty, for there is no one who can compel Allah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9968