Every part and even the end of our actions should be accompanied by acknowledgement of its shortcomings and the fear of it being rejected. i.e. every good deed by nature
should be done as best as possible but in the end it should be realised that Allah's rights could not be fulfilled as they ought to be. Moreover there should be fear and anxiety in the heart that because there may be shortcomings and corruption in our efforts, they may be rejected and thrown on our faces on the Day of Qiyamat.
Thus on account of this apprehension, fear and anxiety. we should cry in front of Allah repeatedly seeking His forgiveness.
(From Discourse of Maulana Ilyas Daee ilallah)