James 4:16 - Matthew Poole's English Annotations on the Holy Bible

But now ye rejoice, or, glory; ye please yourselves with them. In your boastings; viz. of your carnal projects, and hopes of what you intend to do, and expect to get: q.d. You vainly boast of your designs and successes, without taking notice of God's providence, under the government of which you and your affairs all are. All such rejoicing is evil; both as being contrary to the word, which assures us so often that it is vain to promise ourselves long life, or prosperity in our worldly business, without God's leave and blessing, Psalms 127:1 Proverbs 16:9,33; and likewise as proceeding from pride and security.