“Therefore I speak to them in parables, because seeing they do not see, and hearing, they do not hear, neither do they understand. And in them the prophecy of Isaiah is fulfilled, which says, “By hearing you will hear, and will in no way understand; Seeing you will see, and will in no way perceive: for this people’s heart has grown callous, and their ears are dull of hearing, and they have closed their eyes; or else perhaps they might perceive with their eyes, hear with their ears, understand with their heart, and should turn again; and I would heal them. But blessed are your eyes, for they see; and your ears, for they hear. For truly I tell you that many prophets and righteous men desired to see the things which you see, and did not see them; and to hear the things which you hear, and did not hear them” (Mat 13:13-17). "Unless you people see signs and wonders," Jesus told him, "you will never believe." John 4:48