What does it mean that unbelief is a moral and not intellectual issue?

Update: Hint:)
Luke 16
31 But he said to him, ‘If they do not hear Moses and the prophets, neither will they be persuaded though one rise from the dead.’”
Update 2: The word of God only! And that is sufficient for everything. 2 Timothy 3

16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, 17 that the man of God may be complete, thoroughly equipped for every good work.
Update 3: Psalms 19 7 The law of the Lord is perfect, converting the soul; The testimony of the Lord is sure, making wise the simple; 8 The statutes of the Lord are right, rejoicing the heart; The commandment of the Lord is pure, enlightening the eyes; 9 The fear of the Lord is clean, enduring forever; The judgments of the... show more Psalms 19
7 The law of the Lord is perfect, converting the soul;
The testimony of the Lord is sure, making wise the simple;
8 The statutes of the Lord are right, rejoicing the heart;
The commandment of the Lord is pure, enlightening the eyes;
9 The fear of the Lord is clean, enduring forever;
The judgments of the Lord are true and righteous altogether.
10 More to be desired are they than gold,
Yea, than much fine gold;
Sweeter also than honey and the honeycomb.
9 answers 9