The Quran describes itself as guidance to what is most suitable.
إِنَّ هَٰذَا ٱلۡقُرۡءَانَ يَهۡدِي لِلَّتِي هِيَ أَقۡوَمُ وَيُبَشِّرُ ٱلۡمُؤۡمِنِينَ ٱلَّذِينَ يَعۡمَلُونَ ٱلصَّٰلِحَٰتِ أَنَّ لَهُمۡ أَجۡرࣰ ا كَبِيرࣰ ا ٩
Indeed, this Qur'an guides to that which is most suitable and gives good tidings to the believers who do righteous deeds that they will have a great reward