Not so - The word translated “so” is taken by some in its etymological force as “strong,” “firm,” and the passage is rendered “the …

But the heart of the foolish does not so.—Or, disperses that which is not right.

The lips of the wise disperse knowledge Scatter it about for the benefit of others; they are communicative and diffusive …

We use knowledge rightly when we disperse it; but the heart of the foolish has nothing to disperse that is good.