It is narrated from Sayyiduna Jarir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to make this supplication: "O Allah, I seek refuge in You from a supplication that is not heard, from a heart that does not humble itself, and from a soul that is never satisfied."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2257