[Avodah] why slichos are so hard to understand

[M Cohen]

Similarly, I always wondered why the nevuahs of Tanach
are so hard to understand.

(ie compare understanding the haftorah readings vs the torah reading each
week)

wrt Tehillim, it is hard to understand maybe due to the claim of 'poetry'

But nevuah of Tanach is Hashem communicating to the Jewish pple thru the
navi!

Why would He use a language that is so hard to understand such that
the rishonim often work so hard (and differ) on what the navi meant or 
was referring to.

Are the these 2 issues (hard to understand language of slichos and tanach)
connected?

gc't,
mordechai cohen