Sight vs Perception

Optical function is a process, but the mind perceives. This is usually called "seeing." What is seen depends largely on what we expect to see. What we expect to see is highly influenced by our emotional state. Emotional state is affected by intellect, ego and Heart. A choice is available to allow Heart to guide intention, which affects perception, which influences emotional response, which can be focused on healing and compassion, thereby leading to a state of peace and happiness. Ego and or intellect can also guide perception, then the emotional response is more uncertain, and more likely to be negative/fearful.

Emotions are felt in the body, but they exist as a result of the above mentioned processes.

Knowledge does have a role in spirituality, but much of it comes from a transcendent Source, rather than out of a book or the intellect. Authenticity of such knowledge can be determined by the fruit of it's sharing or the benefit derived from integrating it into one's life.