In The Words of Charles Spurgeon:
“It now becomes a serious question how far those who abide by the faith once delivered to the saints should fraternize with those who have turned aside to another gospel. Christian love has its claims, and divisions are to be shunned as grievous sins, but how far are we justified in being in confederacy with those who are departing from the truth? It is a difficult question to answer so as to keep the balances of the duties.
“For the present it behooves believers to be cautious, lest they lend their support and countenance to the betrayers of the Lord. It is one thing to overleap all boundaries of denominational restriction for the truth’s sake, this we hope all godly men will do more. It is quite another policy which would urge us to subordinate the maintenance of truth to denominational prosperity and unity. Numbers of easy-minded people wink at error so long as it is committed by a clever man and a good-natured brother, who has many fine points about him. Let each believer judge for himself; but, for our part, we have put on a few fresh bolts to our door, and we have given orders to keep the chain up, for under the color of begging the friendship of the servant, there are those about who aim at robbing the MASTER. We fear it is hopeless ever to form a society which can keep out men base enough to profess one thing and believe another; but it might be possible to make an informal alliance among all who hold the Christianity of their fathers. Little as they might be able do, they could at least protest, and as far as possible free themselves of that complicity which will be involved in a conspiracy of silence.”