French philosopher Blaise Pascal once wrote "In faith there is enough light for those who want to believe and enough shadows to blind those who don't."
Jesus once compared his preaching to someone sowing seeds that fall on various soil types. They described the sorts of reactions that he received, and that messages requiring conviction still receive today, whether they are of a religious nature or not. When he said, "Let him who has ears to hear, listen" he was making an offer. Come and ask me, find out some more. This is exactly what those who were currently following him did. Jesus made it clear that asking for more was ok, he gave enough light to those to wanted to to believe.
Gandhi said "When faith becomes blind, it dies." Amen to that.