Value
Belief is something we believe as the truth through our thoughts. Rule is belief in the form of a set of rules that determine whether we've feel achieved value/important things or not.
While value is what we believe as something valuable, precious, important, or significant in our life. Value is formed from belief, which is the meaning of life experience that has loads of very strong emotion, whether it's positive or negative emotion. Changing value is much more difficult than changing belief, because actually, value is the other name of core belief.
There are 3 period of forming value. First period at the age of 0-7 years old. Second period at the age of 7-14 years old. Third period at the age of 14-21 years old.
It's same like forming process of belief that I've described here and here, because value is other form of belief. Each value is certainly supported by specific beliefs.