久念成疾久病成医
[jiŭ niàn chéng jí jiŭ bìng chéng yī]
It means 'Long-lasting longing can turn into an illness; chronic sickness makes one self-taught in remedies.' It suggests a painful condition arising from enduring yearning and indicates a kind of self-teaching through suffering, reflecting on dealing emotionally and mentally with hardships or love loss.