Inability, broadly defined, refers to the absence of capability, force, or power to carry out a task, often framed in terms of physical, mental, or moral constraints. Authors have long wrestled with this theme, examining its subtleties: John Haslam associated it with legal and intellectual insufficiency, while Philip Schaff saw it as the body's interference with the soul's understanding.
Saint Augustine regarded it as a spiritual flaw, a departure from a higher calling, and Matthew Henry recognized it as a human weakness in need of mercy. Robert Southey underscored its link to humility, stressing human reliance on divine assistance. These viewpoints together illustrate inability as a complex framework through which constraints—whether bodily, intellectual, or ethical—are seen as inherent aspects of the human experience.