BibTeX:
@incollection{Various,
  author = {Various},
  title = {Even His physical condition was reinforced constantly by this Divine Power},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/exhaustion},
}

APA:
Various. Even His physical condition was reinforced constantly by this Divine Power. In *bahaistories.com archive*.

MLA:
Various. "Even His physical condition was reinforced constantly by this Divine Power." *bahaistories.com archive*, n.d..

Chicago:
Various. "Even His physical condition was reinforced constantly by this Divine Power." In *bahaistories.com archive*, n.d..