So they weren't abiding by God's perfect word. Right? They didn't have the heart nor the desire to understand.
John 5:44-47
44 How can ye believe , which receive honour one of another , and seek not the honour that cometh from God only?
45 Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust .
46 For had ye believed Moses, ye would have believed me: for he wrote of me.
47 But if ye believe not his writings, how shall ye believe my words?