It's too bad that Calvin didn't keep his tulips sealed...
"For God so loved the elect that he gave his only begotten Son"
"For God so loved the elect that he gave his only begotten Son"
17-21 "For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.18 Whoever believes in him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God.19 And this is the judgment: the light has come into the world, and people loved the darkness rather than the light because their works were evil.20 For everyone who does wicked things hates the light and does not come to the light, lest his works should be exposed.21 But whoever does what is true comes to the light, so that it may be clearly seen that his works have been carried out in God.”
They believe because God did it for them, it was not their own doing. God gave His Son that the world MIGHT be saved verse 17. He know those that are slave to sin can't believe and He gives the reason why verse 18 they are condemned already, verses 19-20 they love darkness rather than light. Verse 21 those that believe come to the light to show that God did it, not themselves, as in John 1:12-13. "But to all who did receive him, who believed in his name, he gave the right to become children of God,13 who were born, not of blood nor of the will of the flesh nor of the will of man, but of God."
It all makes more since when you read 3:16 in the context of 17-21 to get the full meaning of what is being said.