Quran Tafsir: Surah Al-R'ad (13) - Tafsir Ibn Kathir & More
The Quran enjoins the acceptance of the one and only God. Those who do not believe in God advance the argument that if God is in existence, He should be visible to everyone. But our known universe shows that a thing’s invisibility does not prove that it has no existence at all. An example of this is the force of gravity.
