Jamieson, Fausset and Brown on James 4:3

3. Some of them are supposed to say in objection, But we do "ask" (pray); compare Jas 4:2. James replies, It is not enough to ask for good things, but we must ask with a good spirit and intention. "Ye ask amiss, that ye may consume it (your object of prayer) upon (literally, 'in') your lusts (literally, 'pleasures')"; not that ye may have the things you need for the service of God. Contrast Jas 1:5 with Mt 6:31,32. If ye prayed aright, all your proper wants would be supplied; the improper cravings which produce "wars and fightings" would then cease. Even believers' prayers are often best answered when their desires are most opposed.