«وَأَعْلَمُ عِلْمَ الْيَوْمِ وَالْأَمْسِ قَبْلَهُ»
I know what belongs to today and to yesterday before it.
«وَلَكِنَّنِي عَنْ عِلْمِ مَا فِي غَدٍ عَمِ»
But I am ignorant of what tomorrow holds.
The relation of qablahu ('before it') to al-ams ('yesterday') raises the question whether it merely repeats an established sense or strengthens the contrast between known past and unknown future. Assessment requires attention to purpose and contrast.