Reciprocity — the tendency for prosocial behavior to generate prosocial response — is among the most fundamental dynamics of human relationships. Prevailing theoretical accounts have constructed reciprocity as an immediate and transactional phenomenon: an act extended, a return expected, an exchange completed. Delayed reciprocity, when acknowledged at all, is treated as a strategic deferral rather than as a structurally distinct process. And the psychological mechanism through which a receiver moves from defensive closure to openness to reciprocal engagement — the interior of the temporal interval itself — remains untheorized across traditions. We propose the reciprocal power of the wholesome, defined as the capacity of sustained prosocial behavior to generate delayed reciprocal responses through cognitive and affective reorganization. Wholesome action refers to consistent, non-extractive interpersonal conduct expressing constructive regard without immediate expectation of return. The central claim is that the interval between prosocial initiation and possible reciprocity is not an empty delay but a psychologically active incubation phase, governed by a sequential four-step cascade: attributional reassessment, threat perception reduction, emotional stabilization, and expectation recalibration. Each step is a necessary precondition for the next. Patience is theorized as the key temporal moderator that sustains the cascade to completion. Six formal propositions are advanced, and boundary conditions are mapped to specific steps in the cascade — specifying not only when the model fails but where. Even when reciprocity does not occur, the initiator gains intrinsic psychological benefits independent of relational outcome. Implications are developed for close relationships, trust repair, conflict transformation, leadership, and developmental contexts, alongside a structured agenda for empirical validation.