John 3:16-20 NASB
16 “For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life. 17 For God did not send the Son into the world to judge the world, but that the world might be saved through Him. 18 He who believes in Him is not judged; he who does not believe has been judged already, because he has not believed in the name of the only begotten Son of God. 19 This is the judgment, that the Light has come into the world, and men loved the darkness rather than the Light, for their deeds were evil. 20 For everyone who does evil hates the Light, and does not come to the Light for fear that his deeds will be exposed.
WHY DOES HE 'NOT BELIEVE'?
John 10:26-31 NASB
26 But you do not believe because you are not of My sheep. 27 My sheep hear My voice, and I know them, and they follow Me; 28 and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand. 29 My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of the Father’s hand. 30 I and the Father are one.” 31 The Jews picked up stones again to stone Him.
(Only His Sheep hear and follow and obtain eternal life. Some do not believe BECAUSE they are not His sheep.)
John 6:43-44 NASB
43 Jesus answered and said to them, “Do not grumble among yourselves. 44 No one can come to Me unless the Father who sent Me draws him; and I will raise him up on the last day.
(It is the FATHER who chooses His sheep by drawing them to Jesus.)
Romans 10:8-10 NASB
8 But what does it say? “THE WORD IS NEAR YOU, IN YOUR MOUTH AND IN YOUR HEART”—that is, the word of faith which we are preaching, 9 that if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved; 10 for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation.
(It is the condition of the heart that seperates those who believe from those who don't believe.)
Ezekiel 36:26 NASB
“Moreover, I will give you a new heart and put a new spirit within you; and I will remove the heart of stone from your flesh and give you a heart of flesh.
(It is GOD who provides the new heart ... removing the dead 'heart of stone' and giving a living 'heart of flesh'.)
Ephesians 2:1-10 NASB
1 And you were dead in your trespasses and sins, 2 in which you formerly walked according to the course of this world, according to the prince of the power of the air, of the spirit that is now working in the sons of disobedience. 3 Among them we too all formerly lived in the lusts of our flesh, indulging the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest. 4 But God, being rich in mercy, because of His great love with which He loved us, 5 even when we were dead in our transgressions, made us alive together with Christ (by grace you have been saved), 6 and raised us up with Him, and seated us with Him in the heavenly places in Christ Jesus, 7 so that in the ages to come He might show the surpassing riches of His grace in kindness toward us in Christ Jesus. 8 For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; 9 not as a result of works, so that no one may boast. 10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them.
(The faith to believe that God raised Christ from the dead is a gift from God. Those to whom it is given, are His Sheep.)