John 12:37-43
37 But despite all the miraculous signs he had done, most of the people did not believe in him. 38 This is exactly what Isaiah the prophet had predicted: “Lord, who has believed our message?  To whom will the Lord reveal his saving power?”  39 But the people couldn’t believe, for as Isaiah also said,  40 “The Lord has blinded their eyes and hardened their hearts” so their eyes cannot see, and their hearts cannot understand, and they cannot turn to me and let me heal them.”  41 Isaiah was referring to Jesus when he made this prediction, because he was given a vision of the Messiah’s glory. 42 Many people, including some of the Jewish leaders, believed in him. But they wouldn’t admit it to anyone because of their fear that the Pharisees would expel them from the synagogue. 43 For they loved human praise more than the praise of God.
Holy Bible, New Living Translation, (Wheaton, IL: Tyndale House Publishers, Inc.) 1996.

During every age in human history, people have refused to believe in God despite the evidence He has given us. Before Christ, they refused to believe in what God was going to do and after Christ they refused to believe in what He had done. Some of the people who had seen Christ raise Lazarus from the dead, refused to believe He was from God. Even though they knew Lazarus had been dead for 4 days. As a result of their unbelief, God hardened their hearts.  Does this mean God intentionally prevents people from believing in Him?  No, He simply confirms their own choices. They refuse to believe the evidence before them. After a lifetime of resisting God, people become so set in their ways that they will not even try to believe. Even if someone comes back from the dead, they will not believe. Their own pride is what prevents them. That is why pride is one of the deadliest sins. For such people, it is virtually impossible for them to believe in Christ because their hearts have been hardened by their own pride. Many believe but refuse to admit it. This is just as bad, and Jesus had strong words for these people. The Pharisees that believed Jesus was the Messiah refused to admit it for fear of being kicked out of the synagogue and afraid of loosing their positions among the other religious leaders. When you feel the tug of God on your heart, don’t turn Him away or you may never have the chance to receive Him again.  Today is the day of salvation and today is all you have.

Have a God Day!