Proverbs 1:7 - The fear of the Lord is the beginning of knowledge; fools despise wisdom and instruction.
You may know something, but you will never truly have knowledge and wisdom until you start to fear the Lord. After all, the Lord made everything. He made the heavens and earth and everything in them. And by fear, I do not mean actually being afraid of Him, but fearing Him in such a way that you truly believe He exists and believe what he says in his Holy scriptures.
Chew on that. How do you fear the Lord?