- 久病成医 jiǔbìngchéngyī a long illness makes the patient a doctor(proverb) someone who has been sick for a long time eventually becomes an expert on the disease and its treatment; through long experience one becomes an expert
- 久病成良医 jiǔbìngchéngliángyī a long illness makes a patient into a good doctor(idiom) a person who has been ill for a long time eventually becomes familiar with medical knowledge; metaphorically, one becomes an expert in a field through long experience and trial and error
