The proof of nature here means that man finds a deep rooted belief in his heart and according to our discussion he feels he believes about the life in another world, the Day of Judgment and the divine justice of God.
This needs to be explained in various ways and we will go into the details after discussing the following verses:
Verse 30 of Surah Rom that says:
“So set your face uprightly for religion, in natural devotion to the truth, the nature caused by God on which He has created mankind. There can be no change in God’s religion;
This is the established religion.”
Verses 1, 2, and 3 of Sarah Qiyamah that say:
“I swear by the Day of Resurrection; I swear by the self accusing spirit; does man think that We will never re-assemble his bones?”