Physician, heal thyself

"Physician, heal thyself" is a saying that means a doctor should take care of their own health first before helping others with their health problems.

Just like how parents need to take care of themselves before taking care of their children, doctors also need to take care of themselves before taking care of their patients.

Doctors need to eat healthy food, exercise regularly, and get enough sleep to be healthy. This will help them stay focused and make better decisions when they're examining patients and prescribing medicines.

So, when someone says "physician, heal thyself," they are reminding doctors that they need to be healthy and take care of themselves in order to be the best doctor they can be for their patients.