Human beings organize and navigate their world via schemas.
Schemas are simply mental concepts our mind has created: patterns of thinking (ie. beliefs) and behaviors that construct our individual reality.
We all create our individual experience of reality via personal filters.
We often don't even recognize our own filters, but they absolutely affect what we notice, how we interpret things, and how we make decisions. These thought creations are like a pair of glasses that act like filters to our world, making us attentive and sensitive to certain things in our environment and downright ignoring other things.
REFERENCES
Michalak, Katja. “Schema.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 19 Dec. 2014, www.britannica.com/topic/schema-cognitive.
Rao, T.S. Sathyanarayana, et al. “The Biochemistry of Belief.” Indian Journal of Psychiatry, Medknow Publications, Oct. 2009, www.ncbi.nlm.nih.gov/pmc/articles/PMC2802367/