Read James 4:1-3
James was well aware of the fact that conflict among believers comes from the personal war that goes on within each person.
This conflict within the believer is also referred to in Romans 7:23: "But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members."
Also, Peter warned, "Dearly beloved, I beseech you as strangers and pilgrims, abstain from fleshly lusts, which war against the soul" (1 Pet. 2:11).
James's reference to killing was not necessarily referring to taking a person's life but to destroying someone's character. Previously, James dealt with the viciousness of the tongue. When the tongue is out of control, it can be a lethal weapon used for character assassination.
These are sobering words from the Bible, and today more than ever we need to carefully examine our lives. Much bitterness is displayed not only among the unbelieving world but also among those who call themselves Christians.
Sometimes, in the name of Christ and in a desire to be separate from sin, Christians commit sin by bitterly attacking fellow believers.
We are to take a stand against sin, but we must guard our hearts so that the old nature does not take over, allowing the bitterness of hatred to grip us.
Even though we may totally disagree with what another person is doing, we are still commanded as believers to seek that person's highest good.
"He that hideth hatred with lying lips, and he that uttereth a slander, is a fool" (Prov. 10:18).