It is hidden in the same way that algebra calculus and trigonometry are hidden from first graders.
Remember the book "Everything I Need To Know, I Already Learned in Kindergarten"? I am pretty sure that the man who wrote the book must have been in my class. As we were practicing writing numbers, following the arrows with our big thick pencils, and discerning the 6 from the 9, one little boy took his paper up to the teacher. "Is this right?" He asked. His paper had the numbers neatly in a row, in the proper order. "See? 0, 1, 2, 3, 4, 5, 6, 7, 8, 9." She told him what a good job he did, and he asked her, "What comes next?" She explained to him that was all of the numbers. Before she could explain what was next, this little boy turned to the rest of the class and announced "I know everything that there is to know about arithmetic!"
It was about that same time (in the early 1960's) That there was some talk about "Bible codes". An adult had told me how some people believe that there are things in the Bible that you can only see if you can read Hebrew. I took the question to the Lord, and asked him if it was true. "Did you hide some stuff in the Bible?" I believe was my exact theological question. He affirmed that there were things still to be discovered, and added "Just like I hid your hand on the end of your arm."
There is so much to know. So much to learn. Yet so many are content with what they have and have no interest in growing deeper, learning more, or receiving what God WANTS to give to us. Have you ever wanted to give a gift to someone that you love, or teach something important to them when they did not want to learn it? How it must grieve God when we reject what He wants to give.
Hsa 4:6 My people are destroyed for lack of knowledge: because thou hast rejected knowledge, I will also reject thee, that thou shalt be no priest to me: seeing thou hast forgotten the law of thy God, I will also forget thy children.
I could not help but notice that the 'code' that PetriFB shared with us, came up with Jesus Christ as the Messiah.
I praise God that He taught me so much about Himself, healed me, baptised me in the Spirit, and worked miracles in my life... before well meaning Christians were able to tell me that it isn't true.