John 12:40 (KJV)

Then Jesus said unto them, Yet a little while is the light with you. Walk while ye have the light, lest darkness come upon you: for he that walketh in darkness knoweth not whither he goeth.

While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them.

But though he had done so many miracles before them, yet they believed not on him:

That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed?

Therefore they could not believe, because that Esaias said again,

These things said Esaias, when he saw his glory, and spake of him.

Nevertheless among the chief rulers also many believed on him; but because of the Pharisees they did not confess him, lest they should be put out of the synagogue:

For they loved the praise of men more than the praise of God.

Jesus cried and said, He that believeth on me, believeth not on me, but on him that sent me.

And he that seeth me seeth him that sent me.