From the hymn "A Cudgle For Delusion"

Boast not of your youth or friends or wealth;
Swifter than eyes can wink, by Time
Each one of these is stolen away.
Abjure the illusion of the world
And join yourself to timeless Truth.
Give up the curse of lust and wrath,
Give up delusion, Give up greed;
Remember who can really are
fools are they that are blind to self;
Cast into hell , they suffer there.

Quoted by Shankaracharya in' Self- Knowledge'