فَمَنْ شَاءَ مِنْهُمْ إِلَى الْجَنَّةِ أَدْخَلَهُ فَضْلًا مِنْهُ وَمَنْ شَاءَ مِنْهُمْ إِلَى النَّارِ أَدْخَلَهُ عَدْلًا مِنْهُ
Whomever Allah wills, He admits to Paradise through His grace; and whomever He wills, He admits to Hell according to His justice.
Grace (faḍl) expresses generous favor, while justice (ʿadl) expresses a just decision. Entrance to Paradise is connected with grace and punishment with justice; both remain subject to Allah's will.