Regarding your questions concerning the condition of the
soul during illness. The passages in the "Gleanings" make it quite
clear that physical ailments, no matter how severe, cannot bring any change in
the inherent condition of the soul. As Bahá'u'lláh says: 'The spirit is
permanent and steadfast in its station'. The veil or hindrance that interposes
between soul and body during physical disease is sickness itself. Sickness
reveals itself. Sickness reveals a lack of balance in human organism, an
absence of equilibrium in the forces essential for the normal functioning of
the human body.
(From a letter written on behalf of Shoghi Effendi to an
individual believer, March 8, 1936; Lights of Guidance)