Translation of the verse 21 from Surah An-Nur : Number of verses 64 - - page 352 - Part 18.
O you who believe! Follow not the footsteps of Shaitan (Satan). And whosoever follows the footsteps of Shaitan (Satan), then, verily he commands Al-Fahsha' [i.e. to commit indecency (illegal sexual intercourse, etc.)], and Al-Munkar [disbelief and polytheism (i.e. to do evil and wicked deeds; to speak or to do what is forbidden in Islam, etc.)]. And had it not been for the Grace of Allah and His Mercy on you, not one of you would ever have been pure from sins. But Allah purifies (guides to Islam) whom He wills, and Allah is All-Hearer, All-Knower.
O you who have believed, do not follow the footsteps of Satan. And whoever follows the footsteps of Satan - indeed, he enjoins immorality and wrongdoing. And if not for the favor of Allah upon you and His mercy, not one of you would have been pure, ever, but Allah purifies whom He wills, and Allah is Hearing and Knowing.
(24:21) O Believers, do not follow in Satan's footsteps, for he will incite to indecency and wickedness any who will follow him. If Allah had not shown His Brace and mercy to you, none of you would have been able to cleanse yourself, *18 for it is Allah alone Who cleanses whom He wills, and Allah is All-Hearing, All-Knowing. *19
*18) `Satan' is bent upon involving you in all kinds of pollutions and indecencies: had it not been for the mercy and kindness of Allah Who enables you to differentiate between good and evil and helps you to educate and reform yourselves, you would not have been able to lead a pure and virtuous life on the strength of your own faculties and initiative alone.
*19) It is Allah's Will alone which decides whom to make pious and virtuous. His decisions are not arbitrary but based on knowledge. He alone knows who is anxious to live a life of virtue and who is attracted towards a life of sin. Allah hears a person's most secret talk, and is aware of everything that passes in his mind. It is on the basis of this direct knowledge that Allah decides whom to bless with piety and virtue and whom to ignore,