Its been too long since I have quoted Spurgeon here so time to remedy that with this fantastic quote from his book on soulwinning which I have just started to re-read online where it is available free:

"if we do not teach men something, we may shout, 'Believe! Believe! Believe!' but what are they to believe? Each exhortation requires a corresponding instruction, or it will mean nothing. 'Escape!' From what? This requires for its answer the doctrine of the punishment of sin. 'Fly!' But whither? Then must you preach Christ, and His wounds; yea, and the clear doctrine of atonement by sacrifice. 'Repent!' Of what? Here you must answer such questions as, What is sin? What is the evil of sin? What are the consequences of sin ? 'Be converted!' But what is it to be converted? By what power can we be converted? What from? What to? "