The paper endeavors to explain how a (legal) rule is obeyed and is meant to offer an explanation of the normative mind that complements the standard view based on the idea of content-independent reasons. More precisely the purpose of the paper to show that the ontological status of a legal rule depends upon the mental content generated by an individual confronted with such a rule, a mental content that is a personal rule. The paper after having clarified at section 1 a grammar of basic concepts such as normative mind, rule-following and personal rules, advances a subjective ontology of rules (section 2). The paper then discusses the content-independent and content-dependent reasons to follow the law (section 3) and develops an initial pheno...