For God did not send his Son into the world to condemn the world, but to save the world through him. -- John 3
In John 6:37, Jesus says, “All that the Father gives me will come to me.” And in verse 44, he says, “No one can come to me unless the Father who sent me draws him.” And in verse 65, he says, “No one can come to me unless it is granted him by the Father.”
In other words, most of the work of the salvation of any person is already done by God without and before he hears the Gospel from an evangelist.
My sheep hear my voice, and I know them, and they follow me." John 10
People who have been given by the Father to the Son, people who have been convicted by the Holy Spirit, people who have been drawn by the Father are also people who are already prepared to follow the voice of Jesus.
So the gospel is actually for certain people in the crowd, and those people have been prepared to respond to it. This cannot say that the evangelist can determine who they are, but he can be confident that if he goes where the Holy Spirit directs and actually preaches the Good News of salvation, those who have been enabled by the Father will respond.
All the evangelist has to do is speak in Jesus' voice, the voice of Jesus to His sheep, not the voice of Jesus to the wolves and vipers.
Some people will say, "We must convict sinners of their sin," but scripture says:
And when He [the Holy Spirit] has come, He will convict the world of sin, and of righteousness, and of judgment. -- John 16
So, no, it's not the job of the Gospel evangelist to convict sinners of their sins...that's the Holy Spirit's job.
It was the job of the Holy Spirit to inspire holy men to pen the words of Christ, and likewise works thru holy men to convict the world of sin, and of righteousness, and of judgment, which His inspired word reveals. The work of the Spirit and the instrumentality of men is not an either/or situation, but a cooperation,
"For we are labourers together with God: ye are God's husbandry, ye are God's building." (1 Corinthians 3:9)
For instance, beginning in Acts 2, we see mystified and and scoffers being told that what they heard Scripturally signified the beginning of the Last Days, and that they in unbelief had murdered their own manifestly God-sent Messiah,
"Him, being delivered by the determinate counsel and foreknowledge of God, ye have taken, and by wicked hands have crucified and slain."(Acts 2:23)
Which is sin,
"Of sin, because they believe not on me;" (John 16:9)
But that God raised Him up,
"Whom God hath raised up, having loosed the pains of death: because it was not possible that he should be holden of it," (Acts 2:24)
Which is righteousness,
"Of righteousness, because I go to my Father, and ye see me no more;" (John 16:10)
And that this Christ now sat on the Father's throne, (Acts 2:30) as present savior and future judge,
"For David is not ascended into the heavens: but he saith himself, The Lord said unto my Lord, Sit thou on my right hand, Until I make thy foes thy footstool." (Acts 2:34-35)
Which is judgment,
"Of judgment, because the prince of this world is judged," (John 16:11) first of enemy #1, and chief murderer, and then those who were deceived by him.
Thus they were convicted of their need for salvation in the light of their sins and judgment to come,
"Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost." (Acts 2:37-38)
Likewise in Acts 7, holy Stephan reiterates the impenitence of Israel and then applies this to the leaders who opposed his preaching, but being convicted of their sins they remained impenitent and sought to silence their conscience by killing Stephan.
Likewise in Acts 13, Paul gives a similar sermon to the Jews, concluding,
"Beware therefore, lest that come upon you, which is spoken of in the prophets; Behold, ye despisers, and wonder, and perish: for I work a work in your days, a work which ye shall in no wise believe, though a man declare it unto you." (Acts 13:40-41)
And though
"many of the Jews and religious proselytes followed Paul and Barnabas" when other Jews
"saw the multitudes, they were filled with envy, and spake against those things which were spoken by Paul, contradicting and blaspheming," (Acts 13:45) resulting in Paul focusing on the Gentiles in judgment upon them.
Later, Paul
"reasoned of righteousness, temperance, and judgment to come" with Felix, who, being thus convicted, "trembled, and answered, Go thy way for this time; when I have a convenient season, I will call for thee." (Acts 24:25)
Thus it is clear that the Holy Spirit uses men to convict souls of of sin, and of righteousness, and of judgment, though He is under no obligation to do so. Souls appreciate their needs for salvation in the light of the holiness and judgment of almighty God, and as in Scripture, preaching needs to aim as the conscience and sow faith in the heart.
She had heard street preachers many times before. They had always pointed to her and "told her the truth with love" that she was a vile sinner and that her sin was taking her to hell. You, see, they had to convict her first.
But her reaction was: "Okay, so I'm going to hell. My life is already hell. Bye, Felicia."
Until one night, on the first night my congregation set out to preach to the prostitutes on that street, this evangelist preached something she'd never heard before. He and his fellows later noted among themselves something they hadn't realized until later: That this woman had never seemed to be listening to the sermon, yet she had never actually strayed out of earshot.
But when the evangelist finished his sermon, she walked up to him and actually poked her finger in his chest, demanding: "That stuff you said about being a new creation in Christ and all the old things going away...is that the truth?"
Nobody had ever preached that to her before. She'd been told by previous preachers she was going to hell because they all thought they needed to do the Holy Spirit's job and convict her of her sin. The Holy Spirit had already convicted her of her sin--which is why she hung around when an evangelist finally tool the next step and actually preached the gospel of the Savior.
And the preaching of the evangelist is not contrary to her conversion but foundational, as the gospel of the Savior includes pointing out sin, and is not simply about who Christ is. The one precedes the others, but both are necessary, and Christ convicted souls of sin, and thus called them to repentance, and commanded His own to do likewise.
For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: All these evil things come from within, and defile the man. (Mark 7:21-23)
But woe unto you that are rich! for ye have received your consolation. Woe unto you that are full! for ye shall hunger. Woe unto you that laugh now! for ye shall mourn and weep. (Luke 6:24-25)
The world cannot hate you; but me it hateth, because I testify of it, that the works thereof are evil. (John 7:7)
And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem. (Luke 24:47)
