This Holy Surah is one of the Makki Surahs. It discusses doctrine, Resurrection Day conditions and its requital, punishment, horrors and the universal overturn that will happen on that Day. The Messenger Muhammad (saws) said:
“Whoever wishes to look at the Day of Resurrection, as if he is seeing it with this eye, then let him recite: ‘When the sun Kuwwirat’ and ‘When the heaven is cleft sunder (Infatarat) and ‘When the heaven is split asunder.”
Hence, this great Surah clarifies the huge overturn that will happen to this monotonous usual existence and the universe system and its content. We should know that, sometimes, the monotony of a blessing makes human loses the sense of its value. As for the incidents on the Resurrection Day, they are related with the blessings that Allah (swt) has favored us with, that are used to be stable, continuous and settled. But a day will come, when their parts will demolish, separate and change as Allah (swt) wills for all His creation.
This Surah, as well, talks about the revelation that descended to the Prophet Muhammad (saws) and about people’s attitude towards it. It, also, affirms two important issues, apparently, they contradict each other, but in fact, they are consistent; they are the servant’s free will of choosing and Allah’s (swt) will, The Creator.
 Sunan At-Tirmidhi: The Book on Tafsir, chapter: 73, Hadith No. 3333