The grass withereth, the flower fadeth: but the word of our God shall stand forever. Isaiah 40:8
That many people find the Bible hard to understand will not be denied by those acquainted with the facts.
I venture to give a short answer to the question, “Why is the Bible hard to understand?”: I believe that we find the Bible difficult because we try to read it as we would read any other book, and it is not the same as any other book!
The Bible is a supernatural book and can be understood only by supernatural aid. It is not addressed to just anybody. Its message is directed to a chosen few. Whether these few are chosen by God in a sovereign act of election or are chosen because they meet certain qualifying conditions I leave to each one to decide as he may.
But whatever may have taken place in eternity, it is obvious what happens in time: some believe and some do not; some are morally receptive and some are not; some have spiritual capacity and some have not. It is to those who do and are and have that the Bible is addressed. Those who do not and are not and have not will read it in vain!
The saving power of the Word is reserved for those for whom it is intended. The secret of the Lord is with them that fear Him. The impenitent heart will find the Bible but a skeleton of facts without flesh or life or breath!