Shaikh Umar Birbalwi (Allah have mercy on him) said,
‘Be watchful of development of heedlessness (ghafalh).
Being free from heedlessness (per se) does not mean that a person abstains from all sinful activity (for ever). Humans have their limitation and intentionally or unintentionally sinful acts are committed (occasionally).
Heedlessness is that when an individual loses his/her ability to decipher whether a sinful activity has been committed (hence he acknowledges, amends and repents). It is like developing an internal (spiritual) weighing-scale needle. A minuscule of addition or subtraction is quickly acknowledged by the spiritual aspirant on whether he is receding backwards or progressing forwards.’
Anwar e Umar ra, malfuz 14