Hidayah

"And truly, it (this Qur'ân) is a guide and a mercy for the believers."

"إِنَّكَ لا تَهدى مَن أَحبَبتَ وَلٰكِنَّ اللَّهَ يَهدى مَن يَشاءُ ۚ وَهُوَ أَعلَمُ بِالمُهتَدينَ"

"translate: It is true thou wilt not be able to guide every one, whom thou lovest; but Allah guides those whom He will and He knows best those who receive guidance."