then shall there enter in by the gates of this city kings and princes sitting upon 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 for ever.
Jeremiah 17:23 But they hearkened not, neither inclined their ear, but made their neck stiff, that they might not hear, and might not receive instruction.
Jeremiah 17:24 And it shall come to pass, if ye diligently hearken unto me, saith Jehovah, to bring in no burden through the gates of this city on the sabbath day, but to hallow the sabbath day, to do no work therein;
Jeremiah 17:25 then shall there enter in by the gates of this city kings and princes sitting upon 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 for ever.
Jeremiah 17:26 And they shall come from the cities of Judah, and from the places round about Jerusalem, and from the land of Benjamin, and from the lowland, and from the hill-country, and from the South, bringing burnt-offerings, and sacrifices, and meal-offerings, and frankincense, and bringing [sacrifices of] thanksgiving, unto the house of Jehovah.
Jeremiah 17:27 But if ye will not hearken unto me to hallow the sabbath day, 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 the gates thereof, and it shall devour the palaces of Jerusalem, and it shall not be quenched.
The verse centers on "shall", "enter", "gates", "city", "kings", "princes", "sitting", and "upon". It is saying that the verse draws attention to "shall" and "enter", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 24's "And it shall come to pass if..." into verse 26's "And they shall come from the cities...", so "shall" and "enter" belong inside that flow. In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "shall" and "enter" with trust shaped by these words, not by a vague optimism outside the passage.