BELIEF - (Merriam-Webster)  

1: a state or habit of mind in which trust or confidence is placed in some person or thing 

2: something that is accepted, considered to be true, or held as an opinion : something believed 

3: conviction of the truth of some statement or the reality of some being or phenomenon especially when based on examination of evidence.  

Have you ever tried to change somebody's mind? 

A belief is based upon a person's past.   

If you want to change the future, you have to understand their past.   

That is where Engagement is the right pillar.