The Holy Spirit causes the elect to believe and draws them to Himself. Not one of God’s elect will be lost. Remember, Christ died for all the elect.
John 6:37 – All that the Father gives me will come to me, and whoever comes to me I will never cast out.
John 6:44 – No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.
Matthew 16:13-17 – Now when Jesus came into the district of Caesarea Philippi, he asked his disciples, “Who do people say that the Son of Man is?” And they said, “Some say John the Baptist, others say Elijah, and others Jeremiah or one of the prophets.” He said to them, “But who do you say that I am?” Simon Peter replied, “You are the Christ, the Son of the living God.” And Jesus answered him, “Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven.”
John 11 – Read full chapter here