Every rung in the ladder is important. The rung of brotherly kindness causes Christians to really stretch to grab hold, because it is not an easy achievement, even though we might think loving our brethren is one of the easier things to do.
This is a very serious situation. We need to search our hearts to see if we are or are not really doing God’s will. We individually need to ask ourselves, “Are there things in my life which represent the mixed multitude? Am I harboring anything that is not worthy of the approval of God?” If so, then that thing is an enemy and will fight against God.