CHAPTER 17 Ju1. 27 
Punishment for Judah
The sin of Judah is written with a pen of iron, and with the point of a diamond: it is engraved on the tablet of their heart, and on the horns of your altars; 2while their children remember their altars and their Asherim by the green trees on the high hills. 3My mountain in the field, I will give your substance and all your treasures for a spoil, and your high places, because of sin, throughout all your borders. 4You, even of yourself, shall discontinue from your inheritance that I gave you; and I will cause you to serve your enemies in the land which you don’t know: for you have kindled a fire in My anger which shall burn forever. 5Thus says Yahweh: Cursed is the man who trusts in man, and makes flesh his arm, and whose heart departs from Yahweh. 6For he shall be like the heath in the desert, and shall not see when good comes, but shall inhabit the parched places in the wilderness, a salt land and not inhabited. 7Blessed is the man who trusts in Yahweh, and whose trust Yahweh is. 8For he shall be as a tree planted by the waters, who spreads out its roots by the river, and shall not fear when heat comes, but its leaf shall be green; and shall not be careful in the year of drought, neither shall cease from yielding fruit. 9The heart is deceitful above all things, and it is exceedingly corrupt: who can know it? 10I, Yahweh, search the mind, I try the heart, even to give every man according to his works, according to the fruit of his doings. 11As the partridge that sits on eggs which she has not laid, so is he who gets riches, and not by right; in the midst of his days they shall leave him, and at his end he shall be a fool.
Jeremiah Prays to God
12A glorious throne, set on high from the beginning, is the place of our sanctuary. 13Yahweh, the hope of Israel, all who forsake You shall be disappointed. Those who depart from Me shall be written in the earth, because they have forsaken Yahweh, the spring of living waters. 14Heal me, O Yahweh, and I shall be healed; save me, and I shall be saved: for You are my praise. 15Behold, they tell me, Where is the word of Yahweh? let it come now. 16As for me, I have not hurried from being a shepherd after you; neither have I desired the woeful day; you know: that which came out of my lips was before Your face. 17Don’t be a terror to me: You are my refuge in the day of evil. 18Let them be disappointed who persecute me, but let not me be disappointed; let them be dismayed, but don’t let me be dismayed; bring on them the day of evil, and destroy them with double destruction.
Observance of the Sabbath
19Thus said Yahweh to me: Go, and stand in the gate of the children of the people through which the kings of Judah come in and by which they go out, and in all the gates of Jerusalem; 20and tell them, Hear the word of Yahweh, you kings of Judah, and all Judah, and all the inhabitants of Jerusalem, that enter in by these gates: 21Thus says Yahweh, Take heed to yourselves, and bear no burden on the Sabbath day, nor bring it in by the gates of Jerusalem; 22neither carry forth a burden out of your houses on the Sabbath day, neither do any work: but make the Sabbath day holy, as I commanded your fathers. 23But they didn’t listen neither turn their ear, but made their neck stiff that they might not hear and might not receive instruction. 24It shall happen, if you diligently listen to Me, says Yahweh, to bring in no burden through the gates of this city on the Sabbath day, but to make the Sabbath day holy, to do no work therein; 25then shall there enter in by the gates of this city kings and princes sitting on the throne of David, riding in chariots and on horses, they, and their princes, the men of Judah, and the inhabitants of Jerusalem; and this city shall remain forever. 26They shall come from the cities of Judah, and from the places around Jerusalem, and from the land of Benjamin, and from the lowland, and from the hill country, and from the South, bringing burnt offerings, sacrifices, meal offerings and frankincense, and bringing sacrifices of thanksgiving to the house of Yahweh. 27But if you will not listen to Me to make the Sabbath day holy, and not to bear a burden and enter in at the gates of Jerusalem on the Sabbath day; then will I kindle a fire in its gates, and it shall devour the palaces of Jerusalem, and it shall not be quenched.

Commentary

17:1 The simple interpretation of this would be that sin has permanent consequences upon our heart or mind.
17:9 In the context, this is a description of the state of Judah’s heart at Jeremiah’s time (18:12). Our hearts are indeed deceitful, but God judges us according to what is in our heart (:10). It’s not the case that we are born with a sinful heart and so we will inevitably be condemned for having one. The Lord Jesus was of our human nature and yet He never sinned; whatever we say about human nature we say about Him. 
17:10 God searches our heart in order to judge our works; because how we think is how we act- in the end.
17:13 The first half of the verse is Jeremiah praying to God; God responds in the second half of the verse; and the prayer resumes in :14. Prayer isn’t simply requests, it involves meditation, reflections and thinking of God’s response.
17:25 If Judah had been obedient, it’s possible that God’s Kingdom as it was in the form of Israel could have developed into His full Kingdom on earth. He has set up all kinds of potential situations throughout history, which tragically have been unfulfilled because of human weakness.
17:27 This eternal fire is paralleled with God’s eternal wrath (:4). The punishment for the wicked is eternal death (Rom. 6:23); not conscious existence in fire. Fire consumes back to dust. The eternity of God’s anger will be in the sense that sinners will be punished by eternal death; but death is unconsciousness.