Answer:
Paul was a brilliant man. God gave him such spiritual perception that it dazzles and confuses people even today... as his writings reveal.
He could teach spiritual lessons at the simplest level of human understanding... easy to digest (as milk). And he could dive into spiritual depths that only the most mature of God's called-out-ones could grasp - hard to digest (meat).
"Brothers, I could not address you as spiritual but as worldly - mere infants in Christ. I gave you milk, not solid food (KJV, meat), for you were not ready for it. Indeed, you are still not ready." (I Cor.3:1-2 NIV)
"...We have much to say about this, but it is hard to explain because you are slow to learn. In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God's Word all over again. You need milk, not solid food! Anyone who lives on milk, being an infant, is not acquainted with the teaching about righteousness. But solid food is for the mature, who by constant use have trained themselves to distinguish good from evil." (Heb.5:11-14 NIV)
Some people say Paul's writings shouldn't be included in The Bible, because they cannot even digest the "milk" he dispenses... much less the "meat." These folks aren't "spirit-minded," but are carnal minded, which is the natural mind of man that doesn't have God's Truth revealed to it.
Of these people, Peter says: "Bear in mind that our Lord's patience means salvation, just as our brother Paul also wrote to you with the wisdom that God gave him. He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do other Scriptures, to their own destruction...
"...Therefore, dear friends, since you already know this, BE ON YOUR GUARD so that you may not be carried away by the error of lawless men..." (II Peter 3:15-17 NIV)
The question contradicts itself. If it isn't in the Bible, it isn't "biblical writings."
bible
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The Intertestamental writings include the books of First and Second Maccabees. They chronicle the fight between Antiochus Epiphanes and the family of the Maccabees. They are not included in the current Protestant Canon, but are found in the Roman Catholic Bible.
Canaanites. The Jews
Because it was written by Ezra, who (like Daniel and Esther) achieved only one of the lower levels of prophecy.
The bible came first.
the Bible
Psalm
The Song of Solomon is included in the Bible because it is a poetic and allegorical depiction of love, often interpreted as symbolizing the relationship between God and his people.
The bible!