Its funny how you rely on the outside being truthful while you cant even trust your inside . Example ? You might sit at a desk and have the image of your car standing outside the campus in the parking lot . But in reality the car was taken away by a criminal . But your head has that older image of your car in mind until your senses proof yourself wrong . Another example . Imagine yourself sitting in a white room with nothing in it except a light bulb . Everything whats going on in your mind is imagination and doesnt resemble reality . You think about your mom how shes cooking right now ? In reality she might be sleeping . You cant even trust your mind and should start from there , because if you analyzed that you can take in reality as it is and dont rely on information by other sources people to built your reality . And to lying . You yourself know that lying does harm yourself . You know that by getting bad thoughts and doubts etc . So dont do what causes these kind of feelings .