“I once asked him (the Imam) (a.s.), about the limits of illness because of which it is obligatory on the patient not to fast as is the case on a journey, ‘. . . one who is on a journey or suffers from an illness. . . .’ He (the Imam) said, ‘It is up to him to decide. If he finds weakness, he eats and if he finds strength he fasts, regardless of the degree of illness.’”