Passage
Thus saith the Lord: If the heavens above can be measured, and the foundations of the earth searched out beneath, I also will cast away all the seed of Israel, for all that they have done, saith the Lord.
Thus saith the Lord: If the heavens above can be measured, and the foundations of the earth searched out beneath, I also will cast away all the seed of Israel, for all that they have done, saith the Lord.
Jeremiah 31:35 Thus saith the Lord, who giveth the sun for the light of the day, the order of the moon and of the stars, for the light of the night: who stirreth up the sea, and the waves thereof roar, the Lord of hosts is his name.
Jeremiah 31:36 If these ordinances shall fail before me, saith the Lord: then also the seed of Israel shall fail, so as not to be a nation before me for ever.
Jeremiah 31:37 Thus saith the Lord: If the heavens above can be measured, and the foundations of the earth searched out beneath, I also will cast away all the seed of Israel, for all that they have done, saith the Lord.
Jeremiah 31:38 Behold the days come, saith the Lord, that the city shall be built to the Lord from the tower of Hanameel even to the gate of the corner.
Jeremiah 31:39 And the measuring line shall go out farther in his sight upon the hill Gareb: and it shall compass Goatha,
The verse centers on "thus", "saith", "lord", "heavens", "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 shall fail before me..." into verse 38's "Behold the days come saith the Lord...", 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.