Charles H. Spurgeon on Psalms 67:6

Then shall the earth yield her increase. Sin first laid a curse on the soil, and grace alone can remove it. Under tyrannical governments lands become unproductive; even the land which flowed with milk and honey is almost a wilderness under Turkish rule; but, when the principles of true religion shall have elevated mankind, and the dominion of Jesus shall be universally acknowledged, the science of tillage shall be perfected, men shall be encouraged to labour, industry shall banish penury, and the soil shall be restored to more than its highest condition of fertility. We read that the Lord turneth "a fruitful land into barrenness, "for the wickedness of them that dwell therein, and observation confirms the truth of the divine threatening; but even under the law it was promised, "The Lord shall make thee plenteous in every work of thine hand, in the fruit of thy cattle, and in the fruit of thy land for good." There is certainly an intimate relation between moral and physical evil, and between spiritual and physical good. Alexander notes that the Hebrew is in the past tense, and he concludes that it is ungrammatical to render it in the future; but to us it seems that the prophet bard, hearing the nations praise the Lord, speaks of the bounteous harvest as already given in consequence. On the supposition that all the people praise Jehovah, the earth has yielded her increase. The future in the English appears to be the clearest rendering of the Hebrew. And God, even our own God, shall bless us. He will make earth's increase to be a real blessing. Men shall see in his gifts the hand of that same God whom Israel of old adored, and Israel, especially, shall rejoice in the blessing, and exult in her own God. We never love God aright till we know him to be ours, and the more we love him the more we long to be fully assured that he is ours. What dearer name can we give to him than "mine own God." The spouse in the song has no sweeter canticle than "my beloved is mine and I am his." Every believing Jew must feel a holy joy at the thought that the nations shall be blessed by Abraham's God; but every Gentile believer also rejoices that the whole world shall yet worship the God and Father of our Lord and Saviour Jesus Christ, who is our Father and our God.