﴿ لَوْ نَشَآءُ جَعَلْنَٰهُ أُجَاجًۭا فَلَوْلَا تَشْكُرُونَ ﴾

“[It comes down sweet - but] were it Our will, We could make it burningly salty and bitter: why, then, do you not give thanks [unto Us]?”

If We willed We could make it bitter salty undrinkable — why then will you not give thanks?