Thus saith the Lord GOD; I will yet for this be enquired of by the house of Israel, to do it for them; I will increase them with men like a flock. Ezekiel 36:37 King James Version
"Thus says the Lord GOD: This also I will let the house of Israel ask me to do for them: to increase their people like a flock. Ezekiel 36:37 ESV
God has spoken, and he will do it, and he will be sought unto for it. He requires that his people should seek unto him, and he will incline their hearts to do it, when he is coming towards them in ways of mercy. They must pray for it, for by prayer God is sought unto, and enquired after.
What is the matter of God's promises must be the matter of our prayers. By asking for the mercy promised we must give glory to the donor, express a value for the gift, own our dependence, and put honour upon prayer which God has put honour upon.
Taken from Matthew Henry's Commentary on the Whole Bible by Matthew