Charles H. Spurgeon on Psalms 67:4

And lead(margin) the nations. God now overrules the nations in their ways, but surely they are led by another guide. There is a bridle in their jaws causing them to err. They are held and shaken in the sieve of vanity, until he come to whom the government pertains. Arthur Pridham.

Verses 5-6. Let the people praise thee, O God; let all the people praise thee! What then? Then shall the earth yield her increase; and God, even our own God, shall bless us. Our unthankfulness is the cause of the earth's unfruitfulness. While man is blessing God for his mercies, He is blessing man with his mercies. William Secker, in "The Nonsuch Professor," 1660.