J R Lundbom [Biblical Rhetoric and Rhetorical Criticism, 2015, HBM, Sheffield]]  has pointed out the following poem which I have tried to follow in the AV. I have divided the centre stanza to emphasis the contrast which is the turning point of the passage. 

A. YAHWEH is the speaker
1 Run ye to and fro through the streets of Jerusalem,
and see now, and know,
and seek in the broad places thereof,
if ye can find a man,
if there be any that executeth judgment,
that seeketh the truth;
and I will pardon it.
2 And though they say, The LORD liveth;
surely they swear falsely.

B. Jeremiah speaks to YAHWEH
3 O LORD, are not thine eyes
upon the truth?
thou hast stricken them, but they have not grieved;
thou hast consumed them, but they have refused to receive correction:
they have made their faces harder than a rock;
they have refused to return.

C. Jeremiah speaks to himself
4 Therefore I said, Surely these are poor;
they are foolish:
for they know not the way of the LORD,
nor the judgment of their God.

C’. Jeremiah speaks to himself
5 I will get me unto the great men,
and will speak unto them;
for they have known the way of the LORD,
and the judgment of their God:

B’. Jeremiah speaks to YAHWEH
but these have altogether broken the yoke,
and burst the bonds.
6 Wherefore a lion out of the forest shall slay them,
and a wolf of the evenings shall spoil them,
a leopard shall watch over their cities:
every one that goeth out thence shall be torn in pieces:
because their transgressions are many,
and their backslidings are increased.

A’. YAHWEH speaks to the people
7 How shall I pardon thee for this?
thy children have forsaken me,
and sworn by them that are no gods:
when I had fed them to the full, they then committed adultery,
and assembled themselves by troops in the harlots’ houses.
8 They were as fed horses in the morning:
every one neighed after his neighbour’s wife.
9 Shall I not visit for these things?
saith the LORD:
and shall not my soul be avenged on such a nation as this?