Observe, 1. It is the wisdom of the wise that they treasure up a stock
of useful knowledge, which will be their preservation: Wisdom is
therefore found in their lips (v. 13), because it is laid up in their
hearts, out of which store, like the good householder, they bring
things new and old. Whatever knowledge may be at any time useful to us
we must lay it up, because we know not but some time or other we may
have occasion for it. We must continue laying up as long as we live;
and be sure to lay it up safely, that it may not be to seek when we
want it. 2. It is the folly of fools that they lay up mischief in their
hearts, which is ready to them in all they say, and works terror and
destruction both to others and to themselves. They love devouring words
(Ps. lii. 4), and these come uppermost. Their mouth is near
destruction, having the sharp arrows of bitter words always at hand to
throw about.