They said therefore to him, "What then do you do for a sign, that we may see, and believe you? What work do you do?
IV. Unbelief is a denial of the senses and a closing of the windows of the mind.  It is a refusal to see, to hear, and to understand the mountainous evidence calling men to believe in the Lord Jesus.  It is like a man staring at the Grand Canyon or the Matterhorn and saying, "I do not believe it!"  The Holy Bible, the history of Israel, the great commemorative festivals of Judaism and Christianity, the sweep of the religion of Christ through history and the collateral enlightenment and civilization which invariably attended it, and the lives of faith in all ages these the unbeliever will not see.  The thundering voice of history, the testimony of the calendar, and the witness of all that is highest and best in art, literature, music, architecture, government, and psychology - all are rejected by the unbeliever in the manner of Southey's owl hooting at the noon sun, and saying, "Where is it?  Where is it?"