As humans, we are easily able to change our minds.

Think about how easy it is to lose your train of thought or forget what you said in conversation only moments earlier. This is because our thoughts are the superficial form of consciousness.

Our thinking patterns, including our core beliefs, are reinforced and sustained by repetition and emotional self-identification.

Going deeper within, our emotions are the next level of consciousness. Our emotions form a bridge between our mind and body; they are somewhat more dense and complex, and we have less control over them than we do our thoughts. Emotions are more complicated to modify because our emotional responses are more challenging to exert conscious power over.

In short, emotions aren't in the mind, and this is what makes them difficult to shift.