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, 40 years (or for 50 or 60 years in a son's or daughter's memory) - is not the issue of doctrine or belief that caused the differences in the first place. Invariably, it is a lack of love - and the bitter things that are said by true Christians in the midst of differences.
Francis A. Schaeffer, The Mark of the Christian
christian-life, doctrine, love