13. Who purified himself: Who affirmed the faith giving up disbelief and polytheism, adopted good morals giving up evil morals, and performed good deeds giving up evil deeds. Success does not imply worldly prosperity, but true and real success whether worldly prosperity accompanies it or not. (For explanation, see (E.N. 23 of Surah Younus), (E.Ns 1, 11, 50 of Surah Al-Mominoon); (E.N. 4 of Surah Luqman).