An old woman, having lost the use of her eyes, called in a physician to heal them and made the following agreement in the presence of witnesses:
That if he should cure her blindness, she would pay him a sum of money; but if her infirmity remained, she would owe him nothing.
After the agreement was made, the physician applied his salve to her eyes time and again. However, on every visit, he took away something, stealing all her property little by little.
Once he had stripped her of all her possessions, he declared that he had healed her and demanded the promised payment.
The old woman, upon recovering her sight and finding her house empty of goods, refused to give him anything.
The physician insisted on his claim, and when she continued to refuse, he summoned her before the judge.
Standing up in court, the old woman argued: "The man speaks the truth in one respect, for I did promise to give him a sum of money if I should recover my sight. However, if I remained blind, I was to give him nothing.
Now he declares that I am healed, but I affirm that I am still blind; for when I lost my sight, I saw various chattels and valuable goods in my house. But now, though he swears I am cured of my blindness, I am unable to see a single thing in it."