Transience of the worldly life

فَجَعَلَهُۥ غُثَآءً أَحْوَىٰ

And [then] makes it black stubble.

وَٱلْـَٔاخِرَةُ خَيْرٌ وَأَبْقَىٰٓ

While the Hereafter is better and more enduring.