| Barnes' Notes on the Bible Yea, the Lord shall give that which is good - All that is truly good: all needful temporal blessings; all blessings connected with salvation. And our land shall yield her increase - There shall be fruitful seasons, and the earth shall produce abundance. Compare the notes at Psalm 67:6.
Clarke's Commentary on the BibleThe Lord shall give - good - הטוב hattob, The Good thing - what is the supreme good, the summum bonum, for which man has searched in vain through all his generations. Those who are reconciled to him through the Son of his love shall enjoy the favor of their God; to have which is the supreme happiness of man. Our land shall yield her increase - There shall be neither dearth nor barrenness; for truth, that springs out of the earth, shall yield an abundant harvest, in the conversion of all nations to the faith of our Lord Jesus Christ.
Gill's Exposition of the Entire BibleYea, the Lord shall give that which is good,.... Meaning not merely temporal good, as rain in particular, as some think, because of the following clause; but that which is spiritually good, his good Spirit and his grace, grace and glory: nor will he withhold any good thing from his people; every good and perfect gift comes from him: and our land shall yield her increase; such who are like to the earth, which receives blessing of God, and oft drinks in the rain that comes upon it, and brings forth herbs to the dresser of it, Hebrews 6:2, these increase with the increase of God, bring forth fruits of righteousness, and grow in grace and in the knowledge of Christ; though the whole may be interpreted of the incarnation of Christ, which agrees with what goes before and follows after; see Psalm 67:6.
Geneva Study BibleYea, the LORD shall give that which is good; and our land shall yield her increase.
Jamieson-Fausset-Brown Bible Commentary12, 13. and, under this, the deserted land shall be productive, and men be "set," or guided in God's holy ways. Doubtless, in this description of God's returning favor, the writer had in view that more glorious period, when Christ shall establish His government on God's reconciled justice and abounding mercy.
Matthew Henry's Concise Commentary85:8-13 Sooner or later, God will speak peace to his people. If he do not command outward peace, yet he will suggest inward peace; speaking to their hearts by his Spirit. Peace is spoken only to those who turn from sin. All sin is folly, especially backsliding; it is the greatest folly to return to sin. Surely God's salvation is nigh, whatever our difficulties and distresses are. Also, his honour is secured, that glory may dwell in our land. And the truth of the promises is shown by the Divine mercy in sending the Redeemer. The Divine justice is now satisfied by the great atonement. Christ, the way, truth, and life, sprang out of the earth when he took our nature upon him, and Divine justice looked upon him well pleased and satisfied. For his sake all good things, especially his Holy Spirit, are given to those who ask him. Through Christ, the pardoned sinner becomes fruitful in good works, and by looking to and trusting in the Saviour's righteousness, finds his feet set in the way of his steps. Righteousness is a sure guide, both in meeting God, and in following him | 
