There are many today who regard truth and error as matters of small consequence; if a man lives rightly, they say, it matters not much what his beliefs and opinions are.
Such statements do not surprise us. Night and day are all one to a blind man, truth and error are all one to an ignorant man.
No one can value the truth except those who have been brought to know it; such have a very different estimate of it.
The Word of God says that man’s immortal soul, his eternal state, depends upon his right knowledge of the Truth.
There are certain definite doctrines, and those that hold them not are already marked out in the Scriptures as lost men.
Error is a work of such evil consequences that God commanded the Israelites that all who should propagate it should be put to death (Deut. 13).
Nor is God changed in His judgment in the New Testament; He threatens the Church at Thyatira which was infected with errors, “so I will cast her on a bed of suffering, and I will make those who commit adultery with her suffer intensely, unless they repent of her ways.” (Rev. 2:22)
Dr. Martyn Lloyd-Jones