[az-Zumar 39:21-23] You have not seen how God  sends down rain from the sky, and caused it to penetrate the earth as springs ? Then He causes to grow, therewith, produce of various colours: then it withers; you will see it becomes yellow; then He makes it dry up and crumble away. Truly, in this, is a message of remembrance to men of understanding.

Is one whose heart God has opened to Islam, so that he has received Enlightenment from God, (no better than one hard-hearted)? Woe to those whose hearts are hardened against celebrating the praises of God! they're manifestly wandering (without guide)!

God has revealed  the most beautiful Message in the form of a Book, consistent with itself, (wherein promises of reward are) repeating (with threats of punishment), the skins of those who fear their Lord tremble there at; then their skins and their hearts do soften to the celebration of God's praises. Such is the guidance of God: He guides with it  whom He pleases, but such as God leaves to stray, there is no guide for him.