When he established the clouds above: when he strengthened the fountains of the deep:
When he established the clouds above. The clouds in their constituents are thin and vapoury, and would soon disappear, but that the Lord "established" them.
When he strengthened the fountains of the deep - He made them of greater density, so as to sink down into their deep bed, and not float above in the air, like the clouds; and strengthened the fountain-beds so that the deep should not break forth, as he proceeds to describe in Proverbs 8:29.