Shah Wasiullah Allahabadi (Allah have mercy on him) said,

‘The sinners are to an extent cognizant of the mercy of Allah. Whereas the pious worshippers do not even get a random thought of Allah’s mercy. They assume and focus that they will enter the Paradise by their own efforts. 

The poor sinner thinks what (efforts) do I have? I rely solely on the Mercy and the beneficence of Allah. And this (in realty) facilitates his dealing (with Allah). 

And the issue with the (self sufficient) pious becomes difficult.

Respected Haji (Imdadullah mohajir Makki, Allah have mercy on him) said,

ہے عبادت کا سہارا عابدوں کے واسطے

اور عصائے آہ مجھ بے دست و پا کے واسطے’

Majales Muleh al Ummat, volume 6, page 159