Organon 98

Now, as certainly as we should listen particularly to the patient’s description of his sufferings and sensations, and attach credence especially to his own expressions wherewith he endeavors to make us understand his ailments – because in the mouths of his friends and attendants they are usually altered and erroneously stated, – so certainly, on the other hand, in all diseases, but especially in the chronic ones, the investigation of the true, complete picture and its peculiarities demands especial circumspection, tact, knowledge of human nature, caution in conducting the inquiry and patience in an eminent degree.