Nature is better than a middling doctor

Similar sayings:

Rivers and mountains may change; human nature, never Rivers and mountains may change; human nature, never
An ignorant doctor is no better than a murderer An ignorant doctor is no better than a murderer
The best doctors are Dr Diet, Dr, Quiet, and Dr Merryman The best doctors are Dr Diet, Dr, Quiet, and Dr Merryman
A young doctor makes a full graveyard A young doctor makes a full graveyard
A single untried popular remedy often throws the scientific doctor into hysterics A single untried popular remedy often throws the scientific doctor into hysterics

Chinese sayings and proverbs