Read and reflect on verse 2083 from Surah Al-Israa: Your Sustainer is fully aware of what you are [and what you deserve]: if He so wills, he will bestow [His] grace upon you; and if He so wills, He will...
رَبُّكُمْ أَعْلَمُ بِكُمْ ۖ إِنْ يَشَأْ يَرْحَمْكُمْ أَوْ إِنْ يَشَأْ يُعَذِّبْكُمْ ۚ وَمَا أَرْسَلْنَاكَ عَلَيْهِمْ وَكِيلًا
Your Sustainer is fully aware of what you are [and what you deserve]: if He so wills, he will bestow [His] grace upon you; and if He so wills, He will chastise you. Hence, We have not sent thee [unto men, O Prophet,] with the power to determine their fate,