I have observed one thing among true Christians in their differences in many countries: What divides and severs true Christian groups and Christians — what leaves a bitterness that can last for 20, 30 or 40 years (or for 50 or 60 years in a son’s memory) — is not the issue of doctrine or belief which caused the differences in the first place. Invariably it is lack of love — and the bitter things that are said by true Christians in the midst of differences. These stick in the mind like glue. And after time passes and the differences between the Christians or the groups appear less than they did, there are still those bitter, bitter things we said in the midst of what we thought was a good and sufficient objective discussion. It is these things — these unloving attitudes and words — that cause the stench that the world can smell in the church of Jesus Christ among those who are really true Christians. ~Francis Shaeffer in The Mark of the Christian.