John 5:45-47
Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust.  For had ye believed Moses, ye would have believed me: for he wrote of me.  But if ye believe not his writings, how shall ye believe my words?

Jesus exposes the true problem in the hearts of the Pharisees.  It was not pride and not hypocrisy, though those may have been there, but unbelief.  Plain and simple, they did not believe God.  God sent John as the messenger, and they rejected that, refusing to partake of his baptism or receive his message of the coming Christ.  Jesus did miracles, and they rejected those.  God gave witness of His Son, and they rejected that.  And the Scriptures told so plainly of Christ, and they rejected that.

The Pharisees did not believe what God said.  They did not accept His truth or His proof.  They were living in unbelief.  No wonder their hearts were so far from God.  They stopped their ears at His voice and refused to hear.  They saw, yet they were blind to His working right in front of them.  Their hearts were hardened by unbelief, and their lives proved that heart condition.  And so it is for us that areas of unbelief harden our hearts bit by bit.  Doubt in one area always leads to doubt in another.

But God is consistent.  It was the same truth, a consistent story.  There was nothing Jesus said or did that contradicted what had been written of Him.  And so Jesus simply confronts the Pharisees with that fact.  It all fit together, so any piece they rejected meant they rejected the whole completely.  If they believed the Scriptures, they could not help but believe Jesus, because it was the same message.  Jesus was the in-the-flesh version of the Word of God.  He is what was written.  Those truths aligned so perfectly so that the Jews who knew the law of Moses would believe on the Son of God.

It seems like they had no excuse for their unbelief, but there they were rejecting Christ, conspiring against Him, letting unbelief reign in their hearts.  But what about us?  Is there an area of unbelief in our lives?  Is there something in God’s revealed truth that we refuse to accept?  Is there something about Christ that we doubt?  Let’s not allow unbelief to reign in our hearts.  We can ask God to help us with those things we struggle with.  We can search the Scriptures and allow His Spirit to lead us into truth.  May we not reject any part of God’s truth, but be willing to believe His words.