This work should be read neither as a theory of modeling nor as a methodological proposal. It is not a framework, not a computational program, and not a contribution to applied modeling. De Limite Modellationis articulates a philosophical position on the ethical and structural limits of modeling. It examines modeling not as a neutral instrument of representation, but as an operation of substitution that may become illegitimate when it exceeds its right to operate. The book identifies points at which modeling no longer preserves structure but replaces it—where continuation degrades precision, silence is denied legitimacy, and lived constraint is overwritten by formal adequacy. This work refuses system-building, exemplification, and integration. It offers no synthesis and no closure.