When you receive a letter do you expect to read it and understand what it says, or do you expect it to be intricate and detailed to the point of obscurity? And is a letter different from a doctoral thesis, an essay, and a novel?
A letter is a written or printed communication directed to a person or organization.
A Doctoral thesis is a research paper written to complete the requirements for a degree in a specific discipline
A novel is a work of fiction.
So yes, a letter is different.
Here's an excerpt from a letter
Ephesians 6:10-20 CPDV2009 (10) Concerning the rest, brothers, be strengthened in the Lord, by the power of his virtue. (11) Be clothed in the armor of God, so that you may be able to stand against the treachery of the devil. (12) For our struggle is not against flesh and blood, but against principalities and powers, against the directors of this world of darkness, against the spirits of wickedness in high places. (13) Because of this, take up the armor of God, so that you may be able to withstand the evil day and remain perfect in all things. (14) Therefore, stand firm, having been girded about your waist with truth, and having been clothed with the breastplate of justice, (15) and having feet which have been shod by the preparation of the Gospel of peace. (16) In all things, take up the shield of faith, with which you may be able to extinguish all the fiery darts of the most wicked one. (17) And take up the helmet of salvation and the sword of the Spirit (which is the Word of God). (18) Through every kind of prayer and supplication, pray at all times in spirit, and so be vigilant with every kind of earnest supplication, for all the saints, (19) and also for me, so that words may be given to me, as I open my mouth with faith to make known the mystery of the Gospel, (20) in such a manner that I may dare to speak exactly as I ought to speak. For I act as an ambassador in chains for the Gospel.
Here is a translation a little easier to understand:
Eph 6 :10-20
10 Finally, my brethren, be strong in the Lord and in the power of His might. 11 Put on the whole armor of God, that you may be able to stand against the wiles of the devil. 12 For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places. 13 Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand.
14 Stand therefore, having girded your waist with truth, having put on the breastplate of righteousness, 15 and having shod your feet with the preparation of the gospel of peace; 16 above all, taking the shield of faith with which you will be able to quench all the fiery darts of the wicked one. 17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God; 18 praying always with all prayer and supplication in the Spirit, being watchful to this end with all perseverance and supplication for all the saints— 19 and for me, that utterance may be given to me, that I may open my mouth boldly to make known the mystery of the gospel, 20 for which I am an ambassador in chains; that in it I may speak boldly, as I ought to speak.
How would you go about interpreting this passage?
Proper exegesis would require literal translation because the verses are written literally. Paul is writing to the church at Ephesus regarding a number of issues. While not addressed to a specific pastor, he is writing to believers in the city. VS 1 clearly states
Paul, an apostle of Jesus Christ by the will of God, To the saints who are in Ephesus, and faithful in Christ Jesus:
In the letter, he addresses a number of issues and his prayers in Chapt 1 and 3 are powerful in revelation and helping believers understand who they are in Christ. Chapter six begins with dealing with our children and ends with these wonderful verses reminding the believer who they are and encouraging us in our walk. Praying for one another, staying in unity.
That is how I would interpret the passage.