He will indeed be successful who purifies his soul. And he will indeed fail who corrupts it 91:8-9
Being constantly filled with considerations that are welcomed by the conscience and cherishing positive views about another person is termed as having a “good opinion” (husnu dhan) in religion. As a religious term, good opinion denotes good intention, positive thinking, and perception of the beautiful; this reflects a person’s inner purity and faithfulness. It is most becoming for a righteous believer to maintain good intentions and take everything from the positive when making evaluations about persons or events.