It does seem like irony that the two world wars should have come after so many years of growth of the peace sentiment in the world. But Christianity is on the side of peace, and Christians must keep up the fight for peace. Jesus left a legacy of peace for individuals and for nations who win it: "My peace I give unto you" (John 14:27). There has appeared one evidence of a better public opinion in the fact that in the war each nation sought to justify itself in the eyes of the world as not the aggressor but as being on the defensive. This apology is some concession, at least to enlightened Christian sentiment, which ultimately will banish war from the earth along with slavery, alcohol, the brothel, and other agencies of the devil.
Meanwhile, James occupies the standpoint of the Christian optimist, who fights for the highest and the best. So Simon Peter writes: "Beloved, I beseech you as sojourners and pilgrims, to abstain from fleshly lusts, which war against the soul" (1 Peter 2:11). We need not press the distinction between wars and fightings, though the first means a state of war and the lasting resentment connected with it, while the second refers to battles or outbursts of passion which occur during a state of war. James does not, of course, here refer to wars between nations but to the factional bickerings in the churches, the personal wrangles that embitter church life. "Among you," he adds, to drive the question home.
James answers his first question by a second. "Come they not hence, even of your pleasures that war in your members?" James sees an intimate connection between strife and laxity of life. The case of the church at Corinth is a point where factional divisions and gross immorality flourished together. Plato (Phaedo 66) says: "Wars and factions, and fightings have no other source than the body and its lusts. For it is for the getting of wealth that all our wars arise, and we are compelled to get wealth because of our body, to whose service we are slaves."
James and Plato agree therefore in finding the origin of war in the lusts of the body, but they differ in their opinion as to how to treat the body. Plato exhorts neglect and scorn of the body, while James urges the victory of the spirit over the body. "Plato has no idea that the body may be sanctified here and glorified hereafter; he regards it simply as a necessary evil, which may be minimized by watchfulness, but which can in no way be turned into a blessing" (Plummer).