Whatsoever things were written aforetime WERE written for our learning...

Paul declares in Romans 15.4:

For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the Scriptures might have hope. (my emphasis).

Therefore, we cannot say that some parts are too difficult or too obscure. Calvin was adamant on this point; in his commentary on Romans he writes; "Paul is speaking of the Old Testament...This notable passage shows us that the oracles of God contain nothing vain or unprofitable...it would be an insult to the Holy Spirit to imagine He had taught us anything which is of no advantage to know."

We often read of "The Poetic Books of the Bible", as I commented recently; we invariably know that this is a prelude to allegorising what ought not be allegorised. Often, I fear, certain portions of Scripture are dismissed as a poet's imagination because we feel that we have no line to fathom them. Examples are aplenty in the Old Testament, but for brevity's sake  I will cite two;

1.  He shall cover thee with His feathers, And under His wings shalt thou trust: His truth shall be thy shield and buckler. Psalm 91.4.

2. The LORD hath His way in the whirlwind and in the storm, and the clouds are the dust of His feet. Nahum 1.3 (b).

The first OT Scripture under consideration reveals that God will protect those who would put their trust in Him. However, to a biblical ignoramus, one might think the Almighty to be but a big bird!
When we become more familiar with what is written through a regular reading of God's Book, we realise that God uses similitudes; I have multiplied visions, and used similitudes, by the ministry of the prophets. Hosea 12.10. (my emphasis).
When trying to fathom out what we are reading, I can do no better than quote Stephen Toms (SGAT);

"The Sovereign Grace Advent Testimony has always insisted that God means what He says, and says what He means. Also, that where the plain sense is good sense, it is the right sense. That does not mean that the Lord has never used dreams, visions, types, shadows, parables etc., but the explanations given, and all plainly worded statements, are to be taken as meaning precisely what they say.
Page. 4; REPLACEMENT THEOLOGY Does God Mean What He Says? (my emphasis).

The second Scripture under consideration reveals not only that God controls the weather, but that the clouds are the dust of His feet. The first part we can take literally, but, what exactly is dust? Is not dust dead matter, such as skin that has decayed and falls off our mortal bodies? Clearly we could not apply this similitude literally to God! For God is a Spirit. John 4.24, and besides, He wouldn't have dead particles falling off him as we do! Nevertheless Nahum conveys to us the fact that all the observable clouds that are high above the entire earth are but dust to Him!