Wala takoonoo kallatheena nasoo Allaha faansahum anfusahum ola-ika humu alfasiqoon (surah Al Hashr: 19)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(59:19) And be not like those who forgot Allah and so He made them oblivious of themselves. *30 They are the wicked ones.

Wa laa takoonoo kallazeena nasul laaha fa ansaahum anfusahum; ulaaa`ika humul faasiqoon

*30) That is, forgetfulness of God inevitably leads to forgetfulness of one's own self. When man forgets that he is slave to the Almighty, he will inevitably form a wrong view of his position in the world, and his whole life will go wrong because of this basic errosr, Likewise, when he forgets that he is slave to nobody except AIIah, he does not serve the one whose slave actually he is not. This also is a grave and all-pervading misunderstanding, which corrupts his whole life. Man's real position in the world is that of a slave; he is not free and self-sufficient; and he is slave of only One God, and is no one else's slave beside Him. The person who, in not know this truth, does not in fact know himself. And the person who inspite of knowing this, forgets it at any moment, may commit an act at that very moment, which a disbeliever, or a polytheist or a man forgetful of God only would commit. Man's remaining firm and steadfast on the right path entirely depends on his remembering God at all times. For as soon as he, becomes heedless of Him. he becomes heedless of himself and this very heedlessness turns him into sinfulness.