Even while the New Testament was still being written, the church was contending with serious heresies and dangerous false teachers who seemed to spring up everywhere. This was so much a universal problem that Paul made it one of the qualifications of every elder that he be strong in doctrine and able to refute those who contradict (Titus 1:9). So the church has always been beset by heretics and false teachings, and church history is full of the evidence of this. Obviously, then, we who love the truth cannot automatically shy away from every fight over doctrine. Especially in an era like ours when virtually every doctrine is deemed up for grabs, Christians need to be willing and prepared to contend earnestly for the faith. . . . Clearly, there are two extremes to be avoided. One is the danger of being so narrow and intolerant that you create unnecessary divisions in the body of Christ. The other is the problem of being too broad-minded and sinfully tolerant—so ecumenically minded that you settle for a shallow, false unity with people whom we are commanded to avoid or whose errors we are morally obligated to refute.

– Phil Johnson