Passage
At that time, saith the Lord, I will be the God of all the families of Israel, and they shall be my people.
At that time, saith the Lord, I will be the God of all the families of Israel, and they shall be my people.
Jeremiah 31:1 At that time, saith the Lord, I will be the God of all the families of Israel, and they shall be my people.
Jeremiah 31:2 Thus saith the Lord: The people that were left and escaped from the sword, found grace in the desert: Israel shall go to his rest.
Jeremiah 31:3 The Lord hath appeared from afar to me. Yea I have loved thee with an everlasting love, therefore have I drawn thee, taking pity on thee.
The verse centers on "time", "saith", "lord", "families", "israel", "shall", and "people". It is saying that the verse draws attention to "time" and "saith", so its meaning should be read from those terms before moving to application.
The next verse adds "Thus saith the Lord The people that...", so "time" and "saith" should be read forward into that movement. In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "time" and "saith" with trust shaped by these words, not by a vague optimism outside the passage.