Commentaries
31:1-9 The falls of others, both into sin and ruin, warn us not to be secure or high-minded. The prophet is to show an instance of one whom the king of Egypt resembled in greatness, the Assyrian, compared to a stately cedar. Those who excel others, make themselves the objects of envy; but the blessings of the heavenly paradise are not liable to such alloy. The utmost security that any creature can give, is but like the shadow of a tree, a scanty and slender protection. But let us flee to God for protection, there we shall be safe. His hand must be owned in the rising of the great men of the earth, and we must not envy them. Though worldly people may seem to have firm prosperity, yet it only seems so.
4. waters … little rivers—the Tigris with its branches and "rivulets," or "conduits" for irrigation, the source of Assyria's fertility. "The deep" is the ever flowing water, never dry. Metaphorically, for Assyria's resources, as the "conduits" are her colonies.