Charles H. Spurgeon on Psalms 144:15

Happy is that people that is in such a case. Such things are not to be overlooked. Temporal blessings are not trifles, for the miss of them would be a dire calamity. It is a great happiness to belong to a people so highly favoured. Yea, happy is that people, whose God is the LORD. This comes in as an explanation of their prosperity. Under the Old Testament Israel had present earthly rewards for obedience: when Jehovah was their God they were a nation enriched and flourishing. This sentence is also a sort of correction of all that had gone before; as if the poet would say —all these temporal gifts are a part of happiness, but still the heart and soul of happiness lies in the people being right with God, and having a full possession of him. Those who worship the happy God become a happy people. Then if we have not temporal mercies literally we have something better: if we have not the silver of earth we have the gold of heaven, which is better still. In this psalm David ascribes his own power over the people, and the prosperity which attended his reign, to the Lord himself. Happy was the nation which he ruled; happy in its king, in its families, in its prosperity, and in the possession of peace; but yet more in enjoying true religion and worshipping Jehovah, the only living and true God.