Passage
Thus saith Jehovah: If heaven above can be measured, and the foundations of the earth searched out beneath, then will I also cast off all the seed of Israel for all that they have done, saith Jehovah.
Thus saith Jehovah: If heaven above can be measured, and the foundations of the earth searched out beneath, then will I also cast off all the seed of Israel for all that they have done, saith Jehovah.
Jeremiah 31:35 Thus saith Jehovah, who giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, who stirreth up the sea, so that the waves thereof roar; Jehovah of hosts is his name:
Jeremiah 31:36 If these ordinances depart from before me, saith Jehovah, then the seed of Israel also shall cease from being a nation before me for ever.
Jeremiah 31:37 Thus saith Jehovah: If heaven above can be measured, and the foundations of the earth searched out beneath, then will I also cast off all the seed of Israel for all that they have done, saith Jehovah.
Jeremiah 31:38 Behold, the days come, saith Jehovah, that the city shall be built to Jehovah from the tower of Hananel unto the gate of the corner.
Jeremiah 31:39 And the measuring line shall go out further straight onward unto the hill Gareb, and shall turn about unto Goah.
The verse centers on "thus", "saith", "jehovah", "heaven", "above", "measured", "foundations", and "earth". It is saying that the verse draws attention to "thus" and "saith", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 36's "If these ordinances depart from before me..." into verse 38's "Behold the days come saith Jehovah that...", so "thus" and "saith" 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 "thus" and "saith" with trust shaped by these words, not by a vague optimism outside the passage.