Used to present the gospel directly: God gave his Son so believers would have eternal life, and rejection of the Son leaves a person condemned.
bible
16 For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life. 17 For God didn't send his Son into the world to judge the world, but that the world should be saved through him. 18 He who believes in him is not judged. He who doesn't believe has been judged already, because he has not believed in the name of the one and only Son of God.
Used to show the Gospel's own teaching that salvation requires belief in the Son of God, which the speaker contrasted with Quranic teaching to argue Islam contradicts the Gospel it claims to confirm.
Quoted to argue that eternal life depends on believing in the Son, and unbelief leaves one condemned.
Read to argue that eternal life is through belief in God's only Son and that rejecting the Son leaves one condemned, directly against the idea that one may reach the Father while denying Jesus' sonship.
Read to argue that eternal life depends on believing in the Son, and that rejecting the Son leaves a person condemned already.