The quotation is from 2 Chronicles 7:14 If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.
This refers primarily to the people of Israel, who’s humbling and restoration are in the future. When Jesus Christ returns, they will finally recognise him as their Messiah and humble themselves before God. Jesus will restore the kingdom of Israel as the kingdom of God and the land will be restored to its former fertility in the days when it truly was a land flowing with milk and honey.
Zechariah 12:10 And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.
Psalms 72:16 There shall be an handful of corn in the earth upon the top of the mountains; the fruit thereof shall shake like Lebanon: and they of the city shall flourish like grass of the earth.
Isaiah 30:18 And therefore will the LORD wait, that he may be gracious unto you, and therefore will he be exalted, that he may have mercy upon you: for the LORD is a God of judgment: blessed are all they that wait for him. 19 For the people shall dwell in Zion at Jerusalem: thou shalt weep no more: he will be very gracious unto thee at the voice of thy cry; when he shall hear it, he will answer thee. 20 And though the Lord give you the bread of adversity, and the water of affliction, yet shall not thy teachers be removed into a corner any more, but thine eyes shall see thy teachers... 23 Then shall he give the rain of thy seed, that thou shalt sow the ground withal; and bread of the increase of the earth, and it shall be fat and plenteous: in that day shall thy cattle feed in large pastures. 24 The oxen likewise and the young asses that ear the ground shall eat clean provender, which hath been winnowed with the shovel and with the fan. 25 And there shall be upon every high mountain, and upon every high hill, rivers and streams of waters in the day of the great slaughter, when the towers fall. 26 Moreover the light of the moon shall be as the light of the sun, and the light of the sun shall be sevenfold, as the light of seven days, in the day that the LORD bindeth up the breach of his people, and healeth the stroke of their wound.
Isaiah 32:16 Then judgment shall dwell in the wilderness, and righteousness remain in the fruitful field. 17 And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. 18 And my people shall dwell in a peaceable habitation, and in sure dwellings, and in quiet resting places;
I hope you find this helpful.