It is narrated with the previous chain that the Noble Prophet, peace and blessings be upon him, said: When any one of you makes supplication, he should not say, "O Allah, if You will, forgive me," but rather he should make his desire great (and ask for much), for nothing that Allah gives is too great for Him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9900