يا عَلِيُّ مَا عَرَفَ اللَّهَ حَقَّ مَعْرِفَتِهِ غَيْرِي وَ غَيْرُكَ وَ مَا عَرَفَكَ حَقَّ مَعْرِفَتِكَ غَيْرُ اللَّهِ وَ غَيْرِي
The Holy Prophet (saw): O Ali, no one has ever known God the way he deserves to be known except for you and me, and no one has ever known you as you deserve to be known except for God and me.
Manaqib Ibn Shahr Ashub: volume 3, page 268.
source : erfan.ir