What is the real winning of a soul for God?
From THE SOUL WINNER by C.H. Spurgeon 

    What is the real winning of a soul for God? So far as this is done by instrumentality, what are the processes by which a soul is led to God and to salvation? I take it that one of its main operations consists in instructing a man that he may know the truth of God. Instruction by the gospel is the commencement of all real work upon men's minds. "Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world." Teaching begins the work, and crowns it, too.
The gospel, according to Isaiah, is, "Incline your ear, and come unto Me: hear, and your soul shall live." It is ours, then, to give men something worth their hearing; in fact, to instruct them. We are sent to evangelize, or to preach the gospel to every creature; and that is not done unless we teach them the great truths of revelation. The gospel is good news. To listen to some preachers, you would imagine that the gospel was a pinch of sacred snuff to make them wake up, or a bottle of ardent spirits to excite their brains. It is nothing of the kind; it is news, there is information in it, there is instruction in it concerning matters which men need to know, and statements in it calculated to bless those who hear it. It is not a magical incantation, or a charm, whose force consists in a collection of sounds; it is a revelation of facts and truths which require knowledge and belief. The gospel is a reasonable system, and it appeals to men's understanding; it is a matter for thought and consideration, and it appeals to the conscience and the reflecting powers. Hence, 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? The field of instruction is wide if men are to be made to know the truth which saves. "That the soul be without knowledge, it is not good," and it is ours as the Lord's instruments to make men so to know the truth that they may believe it, and feel its power. We are not to try and save men in the dark, but in the power of the Holy Ghost we are to seek to turn them from darkness to light.
And, do not believe, dear friends, that when you go into revival meetings, or special evangelistic services, you are to leave out the doctrines of the gospel; for you ought then to proclaim the doctrines of grace rather more than less. Teach gospel doctrines clearly, affectionately, simply, and plainly, and especially those truths which have a present and practical bearing upon man's condition and God's grace. Some enthusiasts would seem to have imbibed the notion that, as soon as a minister addresses the unconverted, he should deliberately contradict his usual doctrinal discourses, because it is supposed that there will be no conversions if he preaches the whole counsel of God. It just comes to this, brethren, it is supposed that we are to conceal truth, and utter a half-falsehood, in order to save souls. We are to speak the truth to God's people because they will not hear anything else; but we are to wheedle sinners into faith by exaggerating one part of truth, and hiding the rest until a more convenient season. This is a strange theory, and yet many endorse it. According to them, we may preach the redemption of a chosen number to God's people, but universal redemption must be our doctrine when we speak with the outside world; we are to tell believers that salvation is all of grace, but sinners are to be spoken with as if they were to save themselves; we are to inform Christians that God the Holy Spirit alone can convert, but when we talk with the unsaved, the Holy Ghost is scarcely to be named. We have not so learned Christ. Thus others have done; let them be our beacons, and not our examples. He who sent us to win souls neither permits us to invent false-hoods, nor to suppress truth. His work can be done without such suspicious methods.
Perhaps some of you will reply, "But, still, God has blessed half-statements and wild assertions." Be not quite so sure. I venture to assert that God does not bless falsehood; He may bless the truth which is mixed up with error; but much more of blessing would have come if the preaching had been more in accordance with His own Word. I cannot admit that the Lord blesses evangelistic Jesuitism, and the suppression of truth is not too harshly named when I so describe it. The withholding of the doctrine of the total depravity of man has wrought serious mischief to many who have listened to a certain kind of preaching. These people do not get a true healing because they do not know the disease under which they are suffering; they are never truly clothed because nothing is done towards stripping them. In many ministries, there is not enough of probing the heart and arousing the conscience by the revelation of man's alienation from God, and by the declaration of the selfishness and the wickedness of such a state. Men need to be told that, except divine grace shall bring them out of their enmity to God, they must eternally perish; and they must be reminded of the sovereignty of God, that He is not obliged to bring them out of this state, that He would be right and just if He left them in such a condition, that they have no merit to plead before Him, and no claims upon Him, but that if they are to be saved, it must be by grace, and by grace alone. The preacher's work is to throw sinners down in utter helplessness, that they may be compelled to look up to Him who alone can help them.
To try to win a soul for Christ by keeping that soul in ignorance of any truth, is contrary to the mind of the Spirit; and to endeavour to save men by mere claptrap, or excitement, or oratorical display, is as foolish as to hope to hold an angel with bird-lime, or lure a star with music. The best attraction is the gospel in its purity. The weapon with which the Lord conquers men is the truth as it is in Jesus. The gospel will be found equal to every emergency; an arrow which can pierce the hardest heart, a balm which will heal the deadliest wound. Preach it, and preach nothing else. Rely implicitly upon the old, old gospel. You need no other nets when you fish for men; those your Master has given you are strong enough for the great fishes, and have meshes fine enough to hold the little ones. Spread these nets and no others, and you need not fear the fulfilment of His Word, "I will make you fishers of men."