The mind's machinery has to work on something, and this layer is that something: the beliefs, values, goals, identities and stories a person actually holds. It is the furniture inside someone's head, the material that decides what a message means to them and whether it lands or bounces. Change behaviour without engaging these contents, and you are pushing on a locked door.
Two people can process the same information with the same mental machinery and reach opposite conclusions, because they are not starting from the same place inside. One hears a policy as fairness, the other as theft. One reads an advert as aspiration, the other as insult. The difference is not in how their minds work but in what their minds are working on: the beliefs they hold, the values they rank highest, the group they feel part of, the story they tell about who they are.
This layer is about those contents, the structured material every person carries. It runs from beliefs and attitudes, through the values and goals that set someone's direction, to the deepest and most load-bearing contents of all: self and identity, worldview, morality, ideology, and the personal narrative that stitches a life into a coherent "me". These are not loose opinions you can talk someone out of with a good fact. They are the frame through which every fact is judged.
Why this matters to you
You almost never change behaviour by acting on it directly. You act on what people already believe, value and identify with, and that existing content decides whether your message is welcome or rejected before its content is even weighed. A claim that fits someone's worldview is waved through; the same claim that threatens it is fought off, no matter how well evidenced. Understanding this layer is what lets you meet people where they actually are, framing an ask in terms of a value they already hold rather than firing facts at a frame that will simply repel them. It is also what keeps you from the classic own goal of attacking an identity you were trying to persuade.
What you'll find inside
The pieces here map the contents in rough order of depth. You will start with beliefs and how they actually revise, with attitudes, and with the values and goals that give behaviour its direction, including why losses loom larger than equivalent gains. Then the layer goes deeper, into the several selves people confuse, into identity and the untangling of sex, gender and attraction, and into the autobiographical story that makes a self feel continuous. Finally it reaches the big frames: worldviews, moral foundations, ideology, the future selves that pull us, our tastes, our sense of a good life, and religion and spirituality as comprehensive worldviews. Several of these are sensitive, and the articles handle them as such.
The honest note
The characteristic caution for this layer is about respect, and it is practical, not just polite. The contents people carry, especially their values, identities and sacred beliefs, are held as truths about the world, not as preferences up for negotiation, and treating them as things to be argued away or bought off tends to backfire hard. Much of this material also varies enormously across cultures and is genuinely hard to measure, so confident universal claims about "what people value" deserve suspicion. The useful stance is to take people's inner contents seriously as the real frame they see through, to engage them honestly rather than trying to override them, and to remember that describing how a belief works is never the same as judging whether it is right.