(Those who do good are) Those who stay away from (avoid) major sins and indecent behavior except for minor sins (which they sometimes get involved in because no human is free from fault). (However, they are quick to seek Allaah's forgiveness for these sins and Allaah is ready to forgive them because) Indeed your Rabb is One of extensive mercy. He was best Aware of you when He created you from the earth and when you were foetuses in the wombs of your mothers. (He knows everything about you and knows you even better than you know yourselves) So do not ascribe purity (piety) to yourselves. He knows best who is the most pious (whose level of Taqwa is highest) Najm:32