This working paper presents the Fidelity–Function Model, a conceptual framework for understanding systemic failure, resilience, and historical recurrence across biological, psychological, organizational, and geopolitical domains.The model is grounded in the distinction between Fidelity to Reality—the continuous integration of accurate feedback—and Systemic Fear, defined as the elevation of threat-avoidance from a transient signal to a governing principle. When fear governs, systems suppress feedback, eliminate variability, and prioritize short-term stability (“quiet”) at the expense of functional integrity. This process generates what the model terms falseness debt, leading to brittleness and eventual collapse.Historical and systemic dynamics are represented geometrically as motion on a sphere. Fear-governed systems remain trapped in repetitive equatorial loops of failure and reset, while fidelity-governed systems convert stress into informational gain, achieving escape from recurrence through an ascending spiral of adaptive complexity.The paper introduces a simple mathematical formulation modeling integrity as an exponentially decaying function of feedback suppression, alongside an adaptive regime in which stress increases coherence rather than degrading it. An individual-scale application—the Personal Fidelity Index (PFI)—is proposed as a method for assessing the energetic cost of internal suppression versus truthful integration.This work is intentionally theoretical and hypothesis-generating. It does not claim empirical validation or prescriptive authority, but is offered as a unifying lens for analysis, critique, and further empirical development across disciplines concerned with collapse, resilience, and adaptive systems.