From the Sages

The sages did not treat those already ill, but treated those not yet ill, they did not put in order what was already in disorder, but put in order what was not yet in disorder.

(This statement is attributed to a Chinese medical text called the Huangdi Neijing (also known as The Yellow Emperor's Classic of Medicine), which is one of the oldest and most important texts of traditional Chinese medicine. The Huangdi Neijing is believed to have been written during the Warring States period (475–221 BCE)).