Divisions and separations are most objectionable in religion. They weaken the cause of true Christianity...But before we blame people for them, we must be careful that we lay the blame where it is deserved. False doctrine and heresy are even worse than schism. If people separate themselves from teaching that is positively false and unscriptural, they ought to be praised rather than reproved. In such cases separation is a virtue and not a sin.
- JC Ryle, Warnings To The Churches
"Bad theology will eventually hurt people and dishonor God in proportion to its badness." - John Piper (A Godward Life Volume Two, pg. 377)
"Compare Scripture with Scripture. False doctrines, like false witnesses, agree not among themselves."