James 2:8-9

Now James brings up the law that you should love your neighbor as yourself. It is a good thing to be a person who fulfills this law of the scriptures. However, to show partiality would be to break this law. If you show partiality, then you do not love all your neighbors as yourself. You may love one of your neighbors, but you do not love all of them. The only way to love your neighbor as yourself is to show no favoritism towards your neighbors. It is true that there is probably a sense in which you love people with varying degrees of love. However, the law reveals the degree of love, which is as much as you love yourself. Either way, this is yet another means to backup his point about not showing favoritism.