Charles H. Spurgeon on Psalms 24:5

It must not be supposed that the persons who are thus described by their inward and outward holiness are saved by the merits of their works; but their works are the evidences by which they are known. The present verse shows that in the saints grace reigns and grace alone. Such men wear the holy livery of the Great King because he has of his own free love clothed them therewith. The true saint wears the wedding garment, but he owns that the Lord of the feast provided it for him, without money and without price. "He shall receive the blessing from the Lord, and righteousness from the God of his salvation." So that the saints need salvation; they receive righteousness, and "the blessing" is a boon from God their Saviour. They do not ascend the hill of the Lord as givers but as receivers, and they do not wear their own merits, but a righteousness which they have received. Holy living ensures a blessing as its reward from the thrice Holy God, but it is itself a blessing of the New Covenant and a delightful fruit of the Spirit. God first gives us good works, and then rewards us for them. Grace is not obscured by God's demand for holiness, but is highly exalted as we see it decking the saint with jewels, and clothing him in fair white linen; all this sumptuous array being a free gift of mercy.