"If we would hold fast that which is good, we must not tolerate any doctrine that is not the pure doctrine of Christ’s Gospel. There is a hatred that is downright charity: that is the hatred of erroneous doctrine. There is an intolerance which is downright praiseworthy: that is the intolerance of false teaching in the pulpit. Who would ever think of tolerating a little poison given to him day by day? If men come among you who do not preach “all the counsel of God,” who do not preach of Christ, sin, holiness, of ruin, and redemption, and regeneration, – or do not preach of these things in a Scriptural way, you ought to cease to hear them. You ought to carry out the spirit shown by the Apostle Paul, in Gal.1:8: “Though we, or an angel from heaven, preach any other Gospel unto you than that which we have preached, let him be accursed.”
~ J.C. Ryle

"What a man believes is ultimately going to determine his life. A man who is loose in doctrine eventually becomes loose also in his life and in his behavior. And I do not hesitate to say that the church of God on earth is as she is today primarily because of the looseness of belief in doctrine which entered in the last century, and has continued to the present time. You cannot separate these things; doctrine and conduct are indissolubly linked."
Martyn Lloyd-Jones (Life in the Spirit)

"I am not permitted to let my love be so merciful as to tolerate and endure false doctrine. When faith and doctrine are concerned and endangered, neither love nor patience are in order.... when these are concerned, neither toleration nor mercy are in order, but only anger, dispute, and destruction - to be sure, only with the Word of God as our weapon." - Martin Luther

The Chestnut Mare