This may be meant either, 1. Of a wicked heart showing itself in
burning lips, furious, passionate, outrageous words, burning in malice,
and persecuting those to whom, or of whom, they are spoken; ill words
and ill-will agree as well together as a potsherd and the dross of
silver, which, now that the pot is broken and the dross separated from
the silver, are fit to be thrown together to the dunghill. 2. Or of a
wicked heart disguising itself with burning lips, burning with the
professions of love and friendship, and even persecuting a man with
flatteries; this is like a potsherd covered with the scum or dross of
silver, with which one that is weak may be imposed upon, as if it were
of some value, but a wise man is soon aware of the cheat. This sense
agrees with the following verses.