The crackling of thorns, which for a time make a great noise and blaze, but presently waste themselves, and go out without any considerable effect upon the meat in the pot. So; so vanishing and fruitless.
Related Commentaries of Ecclesiastes 7:6
Ecclesiastes 7:6
6 For as the cracklingb of thorns under a pot, so is the laughter of the fool: this also is vanity.