Thematic Bible: Where wars come from

What causes wars and quarrels among you? Is it not your different desires which are ever at war within your bodies? You desire things and cannot have them, and so you commit murder. You covet things, but cannot acquire them, and so you quarrel and fight. You do not have them, because you do not ask for them. You ask and fail to get them, because you ask with evil, selfish motives, to spend them on your pleasures.