Commenting on the saying of Masters of Tasawwuf that looking back at the past sins (intentionally) is a veil from remembrance of Allah SWT, Hazrat Hakeemul Ummat Mawlana Ashraf Ali Thanawi ra said:
“This saying is in regards to those individuals who have eliminated their gaflah (forgetfulness) and are engrossed in Allah SWT(‘s path).”
Masail us sulook min kalam Malik ul mulook, page 307