To test a proposed model that determined the effects of nurses' spiritual well-being and caring behaviour on their provision of spiritual care to patients. The spiritual dimension of caring gained attention in the recent past as it is recognized to bring positive patient outcomes. A cross-sectional, descriptive, correlational design was used in the study. Data were collected from 300 registered nurses working in the hospitals in Pampanga, Philippines. Partial least square structural equation modelling was used to test the model. Nurses had a high level of ideal and lived perspectives of spiritual well-being. They perceived their caring behaviour to be always manifested and occasionally engaged in spiritual activities that supported patient spirituality. The structural equation model provided a feasible model that was either caring behaviour-laden spiritual well-being or spiritual well-being-infused caring behaviour. Nursing administrators may develop guidelines for practice within their institutions that are considerate of the proposed model. They may focus on caring behaviour-laden spiritual well-being model of nursing practice or spiritual well-being-infused caring behaviour model of nursing practice.