﴿ إِلَّا مَا شَآءَ ٱللَّهُ ۚ إِنَّهُۥ يَعْلَمُ ٱلْجَهْرَ وَمَا يَخْفَىٰ ﴾

“save what God may will [thee to forget] - for, verily, He [alone] knows all that is open to [man's] perception as well as all that is hidden [from it]”

Please check ayah 87:13 for complete tafsir.