Indeed nothing makes a man more unpopular in the controversies of the present day than an insistence upon definition of terms. Anything, it seems, may be forgiven more readily than that.
Men discourse very eloquently today upon such subjects as God, religion, Christianity, atonement, redemption, faith; but are greatly incensed when they are asked to tell in simple language what they mean by these terms. They do not like to have the flow of their eloquence checked by so vulgar a thing as a definition.
Quoted from J. Gresham Machen’s book “What is Faith?”