When looking to permanently change the physical shape of hard materials, it often requires an additional ingredient to be added first (eg. heat, water), then you work the material slowly and gradually, and finally let it rest. If you skip adding the necessary ingredient, work the material too fast, or don’t let it rest, it can break or bounce back.
I often think about how this applies to all forms of change, whether that be in self improvement or social culture.
When I feel impatient about something changing, I remind myself that slow change tends to be more permanent.