Charles H. Spurgeon on Psalms 134:3

The LORD bless thee out of Zion. The Church is the conservator of Divine revelation; the Church is the offerer on earth of true worship; it consists of a company of priests, a royal priesthood, part of whose mission is "to offer up spiritual sacrifices acceptable to God by Jesus Christ." The Church is the heritor of the covenants. God's covenants are made with his Church, and his promises are addressed chiefly to his Church. The Church is the scene of special Divine ministrations, God shows himself to his Church as he does not to that which is called the world. It is also the scene of special heavenly influences: and in a sense next to that in which God is said to reside in heaven, the Church is the dwellingplace of the Most High. Now, what is it to be blessed out of Zion? It is surely to be blessed with Zion's blessings, and to have Zion's endowments and gifts rendered sources of advantage and profit to us. —Samuel Martin.