It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When any one of you makes supplication, he should not say: 'If You wish, grant it to me,' but he should ask Allah with determination and with great eagerness, for nothing is too great for Allah to give."
Hadith Referenceالادب المفرد / كتاب / 607
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب الدعوات : 6339 و مسلم : 2679 و أبوداؤد : 1483 و الترمذي : 3497 و ابن ماجه : 3854»