Free-willers insist that "whosoever believes" proves that "anyone who chooses of their own free will to believe".
I've dealt elsewhere with the fallacy of having the ability to "choose to believe".
Here I'll show that the free-willer view of "whosoever" is a logical fallacy. If I say "whosoever is 6 feet tall or taller", can you choose of your own free will to be 6 feet tall or taller? No, of course not. So the word "whosoever" has no definitive relationship with free will.
Not even close
John 12:40 (KJV 1900) — 40 He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
God blinded men to prevent their belief. Why would God blind someone who had no ability to see?
Why prevent from believing those who had no capacity for belief
Luke notes had men not grown hardened they could have believed
Acts 28:27 (KJV 1900) — 27 For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
Jesus clearly states he hides truth for some as otherwise they would repent and be forgiven
Mark 4:10–12 (ESV) — 10 And when he was alone, those around him with the twelve asked him about the parables.
11 And he said to them, “To you has been given the secret of the kingdom of God, but for those outside everything is in parables,
12 so that “ ‘they may indeed see but not perceive, and may indeed hear but not understand, lest they should turn and be forgiven.’ ”
unregenerate men are shown to receive the word with joy and believe
Luke 8:13 (KJV 1900) — 13 They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.
Mat 11:21-24 Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works, which were done in you, had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes. 22 But I say unto you, It shall be more tolerable for Tyre and Sidon at the day of judgment, than for you. 23 And thou, Capernaum, which art exalted unto heaven, shalt be brought down to hell: for if the mighty works, which have been done in thee, had been done in Sodom, it would have remained until this day.
The adversary steals the word away so men will not believe
Luke 8:11–12 (KJV 1900) — 11 Now the parable is this: The seed is the word of God. 12 Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.
What need is there to steal away a word which cannot be believed?
John 1:6–7 (KJV 1900) — 6 There was a man sent from God, whose name was John. 7 The same came for a witness, to bear witness of the Light, that all men through him might believe.
John the apostle believes the testimony of John the Baptist is sufficient for faith.
John 4:39 (KJV 1900) — 39 And many of the Samaritans of that city believed on him for the saying of the woman, which testified, He told me all that ever I did.
How much exegesis is needed to see men believed based upon the woman's testimony
John 17:20 (KJV 1900) — 20 Neither pray I for these alone, but for them also which shall believe on me through their word;
men will be able to believe based on the apostle's testimony
John 20:31 (KJV 1900) — 31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
The reading of scripture is sufficient for belief
2 Timothy 3:15 (NIV) — 15 and how from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus.
Ephesians 3:4–11 (NIV) — 4 In reading this, then, you will be able to understand my insight into the mystery of Christ, 5 which was not made known to people in other generations as it has now been revealed by the Spirit to God’s holy apostles and prophets. 6 This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus. 7 I became a servant of this gospel by the gift of God’s grace given me through the working of his power. 8 Although I am less than the least of all the Lord’s people, this grace was given me: to preach to the Gentiles the boundless riches of Christ, 9 and to make plain to everyone the administration of this mystery, which for ages past was kept hidden in God, who created all things. 10 His intent was that now, through the church, the manifold wisdom of God should be made known to the rulers and authorities in the heavenly realms, 11 according to his eternal purpose that he accomplished in Christ Jesus our Lord.
As is the preaching of it.
Romans 10:10–17 (KJV 1900) — 10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. 11 For the scripture saith, Whosoever believeth on him shall not be ashamed. 12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him. 13 For whosoever shall call upon the name of the Lord shall be saved. 14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things! 16 But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report? 17 So then faith cometh by hearing, and hearing by the word of God.
Acts 28:23–24 (KJV 1900) — 23 And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.
24 And some believed the things which were spoken, and some believed not.
John 7:31 (KJV 1900) — 31 And many of the people believed on him, and said, When Christ cometh, will he do more miracles than these which this man hath done?
Miracles have power to bring about faith
Deuteronomy 30:11–19 (NET) — 11 “This commandment I am giving you today is not too difficult for you, nor is it too remote. 12 It is not in heaven, as though one must say, “Who will go up to heaven to get it for us and proclaim it to us so we may obey it?” 13 And it is not across the sea, as though one must say, “Who will cross over to the other side of the sea and get it for us and proclaim it to us so we may obey it?” 14 For the thing is very near you—it is in your mouth and in your mind
so that you can do it. 15 “Look! I have set before you today life and prosperity on the one hand, and death and disaster on the other. 16 What I am commanding you today is to love the LORD your God, to walk in his ways, and to obey his commandments, his statutes, and his ordinances. Then you will live and become numerous and the LORD your God will bless you in the land which you are about to possess.17 However, if you turn aside and do not obey, but are lured away to worship and serve other gods, 18 I declare to you this very day that you will certainly perish! You will not extend your time in the land you are crossing the Jordan to possess.19 Today I invoke heaven and earth as a witness against you that I have set life and death, blessing and curse, before you.
Therefore choose life so that you and your descendants may live!
Joshua 24:15–22 (NET) — 15 If you have no desire to worship the LORD, choose today whom you will worship, whether it be the gods whom your ancestors worshiped beyond the Euphrates, or the gods of the Amorites in whose land you are living. But I and my family will worship the LORD!” 16 The people responded, “Far be it from us to abandon the LORD so we can worship other gods! 17 For the LORD our God took us and our fathers out of slavery in the land of Egypt and performed these awesome miracles before our very eyes. He continually protected us as we traveled and when we passed through nations.18 The LORD drove out from before us all the nations, including the Amorites who lived in the land. So we too will worship the LORD, for he is our God!” 19 Joshua warned the people, “You will not keep worshiping the LORD, for he is a holy God. He is a jealous God who will not forgive your rebellion or your sins. 20 If you abandon the LORD and worship foreign gods, he will turn against you; he will bring disaster on you and destroy you, though he once treated you well.” 21 The people said to Joshua, “No! We really will worship the LORD!” 22 Joshua said to the people, “Do you agree to be witnesses against yourselves that you have chosen to worship the LORD?” They replied, “We are witnesses!”