The peace that Christians have because they are in Christ is between them and God and because of that, with each other. However, that does not mean that there will be peace between them and those not in Christ. In fact, these words of our Lord in Matthew 10:34-38 make it clear that those truly in Christ will be so changed by the Gospel, the presence of the Holy Spirit in them, and their new nature that there will be inevitable separation between them and those who are not in Christ. This holds true even within families….
This is true because the genuine believer is so changed that no matter what sort of pressure comes to bear on them, they simply cannot be at peace with the ways of the world or the ways of the flesh. Their conscience is bound to Christ and His Word while those not in Christ have consciences bound to the flesh no matter how religious they are.
Since it is imperative for our conscience to be bound to the Word of God, then the necessity of regularly sitting under a teacher who rightly divides the Word of truth becomes absolute. This is why we must stand firm against those wolves in sheep’s clothing seeking to do away with the study of doctrine and the preaching of the Gospel in our churches.