Charles H. Spurgeon on Psalms 98:2

The LORD hath made known his salvation, —by the coming of Jesus and by the outpouring of the Holy Ghost, by whose power the gospel was preached among the Gentiles. The Lord is to be praised not only for effecting human salvation, but also for making it known, for man would never have discovered it for himself; nay, not so much as one single soul would ever have found out for himself the way of mercy through a Mediator; in every case it is a divine revelation to the mind and heart. In God's own light his light is seen. He must reveal his Son in us, or we shall be unable to discern him. His righteousness hath he openly shewed in the sight of the heathen. This word "righteousness" is the favourite word of the apostle of the Gentiles; he loves to dwell on the Lord's method of making man righteous, and vindicating divine justice by the atoning blood. What songs ought we to render who belong to a once heathen race, for that blessed gospel which is the power of God unto salvation, "for therein is the righteousness of God revealed from faith to faith." This is no close secret; it is clearly taught in Scripture, and has been plainly preached among the nations. What was hidden in the types is "openly shewed" in the gospel.