The Hidden Keys in the Bible

Is it really possible to unlock the mysteries of hidden secrets that are contained within the Bible? And what would be the reason for God and/or his Son to lock up true knowledge of who he and his Son is from his children, whom he says he loves very much and wishes that none should perish? Could it be that God wants to see if his children would go all out to know him and his Son? This would show true love for the parents, and God and his Son is no different than any other parent. They want to se