68. This refers to Prophet Noah’s (peace be upon him) prayer which he at last made after having tried his utmost to reform his people: Lord, help me for I have been overpowered. (Surah Al-Qamar, Ayat 10), and Lord, do not leave even a single disbeliever on the earth. (Surah Nooh, Ayat 26).
69.“Great affliction”may either refer to living a miserable life among the wicked people, or to the flood. (For the story of Prophet Noah, see (Surah Al-Aaraf, Ayats: 59-64); (Surah Younus, Ayats 72-74); (Surah Houd, Ayats 25-48), and(Surah Al-Isra, Ayat 3) and the E.N.s thereof).