Charles H. Spurgeon on Psalms 122:9

Because of the house of the LORD our God I will seek thy good. He prays for Jerusalem because of Zion. How the church salts and savours all around it. The presence of Jehovah, our God, endears to us every place wherein he reveals his glory. Well may we seek her good within whose walls there dwells God who alone is good. We are to live for God's cause, and to be ready to die for it. First we love it (Ps 122:6) and then we labour for it, as in this passage: we see its good, and then seek its good. If we can do nothing else we can intercede for it. Our covenant relation to Jehovah as our God binds us to pray for his people, —they are "the house of the Lord our God." If we honour our God we desire the prosperity of the church which he has chosen for his indwelling. Thus is the poet glad of an invitation to join with others in the Lord's service. He goes with them and rejoices, and then he turns his delight into devotion, and intercedes for the city of the great King. O church of the living God, we hail thine assemblies, and on bended knee we pray that thou mayest have peace and felicity. May our Jehovah so send it. Amen.