This passage seems to be a break in the midst of the Prophet's sermon, in which he fervently addresseth the Lord in prayer, and a blessed prayer it is. It needs no comment: for it is as plain as it is earnest. These are blessed interruptions to preaching, when the Man of God leaves off for a moment speaking to his people, from God in order to speak for his people to God.
Jeremiah 17:12-18
12 A glorious high throne from the beginning is the place of our sanctuary.
13 O LORD, the hope of Israel, all that forsake thee shall be ashamed, and they that depart from me shall be written in the earth, because they have forsaken the LORD, the fountain of living waters.
14 Heal me, O LORD, and I shall be healed; save me, and I shall be saved: for thou art my praise.
15 Behold, they say unto me, Where is the word of the LORD? let it come now.
16 As for me, I have not hastened from being a pastor to follow thee: neither have I desired the woeful day; thou knowest: that which came out of my lips was right before thee.
17 Be not a terror unto me: thou art my hope in the day of evil.
18 Let them be confounded that persecute me, but let not me be confounded: let them be dismayed, but let not me be dismayed: bring upon them the day of evil, and destroye them with double destruction.