Read this quote from J. Gresham Machen:
"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 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."
What is Faith?"; Pg. 14; Machen