A couple of lines of poetry which I remember one of the shuyookh mentioning concerning the negative effects of wasting one’s time:

والوقتُ أنفَسُ ما عُنِيتَ بحِفظِه ** وأراه أسهَلَ ما عليك يَضيعُ

“Time is from the most precious of things which you have been instructed to preserve, yet I see it to be the easiest of things from you that go to waste” End quote.

Translated by

AbdulFattaah Bin Uthman
Abu Fajr