There is a difference between knowledge and perception. Knowledge is more substantial and comes from right thinking and right feeling. Perception is often skewed and inaccurate. There is the cynical statement that "perception is reality" but nothing could be further from the truth because reality is often misperceived or not perceived at all.
Another slogan says, "Don't believe everything you think." Our thoughts are often inaccurate and in error. When confronted with information which does not fit with our opinions, our beliefs, our frames of references, we often discount this new information in an attempt to self justify. This self justification becomes the basis for sin. We become alienated from reality and our continued justification of misperceptions and faulty thinking eventually leads to negative consequences. Another word for this is "denial". People engage in denial out of fear. It is their fear which prevents them from making new beliefs and opinions and better judgments. The ego's need "to be right" is more powerful than the person's need for true knowledge.
Another slogan is "My mind is made up; don't bother me with the facts." Any new information must be forced into my existing belief system or I will reject it as nonsense and thus I engage in what the social psychologists call "confirmation bias." This inability to perceive and accept information that would threaten one's existing belief system leaves many people living in a dream world, in a world of unreality, where they feel safe as long as information and beliefs don't threaten their belief system.
In the spiritual life we understand that our perceptions are often inaccurate, skewed, and "unreal". We humbly listen to others and to our inner intuition to what seems to be right. This process of humbly listening is called discernment. We attempt to understand God's will for us and set aside our own will. As we know from our Christian prayer, the Our Father, which Jesus taught is "... Thy kingdom come, Thy will be down on earth as it is in heaven." It is God's will this is important, not my will, and when I can bring my will in to alignment with God's will, God and I are a dynamic duo. As St. Paul says, "If God is with you, who can be against you?"
Drop the self justification and listen.