What is the biblical basis for the idea that the Bible cannot be understood without aid from God? I have heard this claim often in discussions and also read it several times on this site: 


  The Bible cannot be properly understood without God's help.


Is there a scriptural basis for this claim?

Thank you
Jesus said in Matthew 11:25, "I thank you, Father, Lord of heaven and earth, that you have hidden these things from the wise and understanding and revealed them to little children." By these words we know that God has knowledge to share that we can't get anywhere but from Him. This is reinforced by Jesus saying in Matthew 11:27, "All things have been handed over to me by my Father, and no one knows the Son except the Father, and no one knows the Father except the Son and anyone to whom the Son chooses to reveal him."

In addition, Paul wrote in 1 Corinthians 2:9-13: that we cannot comprehend the things of God unless His Spirit reveal them to us, and that is exactly what He has done to those who love Him:


  But, as it is written, “What no eye has seen, nor ear heard, nor the
  heart of man imagined, what God has prepared for those who love him”—
  
  these things God has revealed to us through the Spirit. For the Spirit
  searches everything, even the depths of God. For who knows a person’s
  thoughts except the spirit of that person, which is in him? So also no
  one comprehends the thoughts of God except the Spirit of God. Now we
  have received not the spirit of the world, but the Spirit who is from
  God, that we might understand the things freely given us by God. And
  we impart this in words not taught by human wisdom but taught by the
  Spirit, interpreting spiritual truths to those who are spiritual.


In Galatians 1:12, Paul tells us how he came by the gospel: "For I did not receive it from any man, nor was I taught it, but I received it through a revelation of Jesus Christ." This is an amazing admission by a man who was a master of his religion and of its holy book. He who sought to kill the disciples of Christ asserts that God had to reveal information not available to his natural mind in order to grasp its truths.

These are some of the arguments that we need God in order to apprehend spiritual truths, such as those in the Bible.