O good soul, does not a thing, applied therapeutically, cure a disease which was caused by that very same thing?
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
आमयो यश्च भूतानां जायते येन सुव्रत । तदेव ह्यामयं द्रव्यं न पुनाति चिकित्सितम्
āmayo yaśca bhūtānāṃ jāyate yena suvrata | tadeva hyāmayaṃ dravyaṃ na punāti cikitsitam
SB 1.5.33