One of his supplications
Nahj al-Balāgha|Volume 1|Book 1|Chapter 78
اللَّهُمَّ اغْفِرْ لِي مَا أَنْتَ أَعْلَمُ بِهِ مِنِّي، فَإِنْ عُدْتُ فَعُدْ لي بِالْمَغْفِرَةِ.
O my Allāh! Forgive me what Thou knowest about me more than I do. If I return (to the sins) Thou return to forgiveness.