This quote is a commentary on medical practice, suggesting that the best physician is one who understands that many medicines are not as effective as they are often perceived to be. It highlights the importance of critical thinking and discernment in medicine, implying that a good physician should not blindly trust all medicines, but should instead evaluate their true efficacy.

The “worthlessness” of medicines could refer to several things. It could imply that some medicines don’t work as well as they’re supposed to or that they have too many side effects to be worth taking. It could also suggest that many illnesses can be better treated through lifestyle changes or other non-pharmaceutical methods, rather than relying on medication.

In the context of today’s world, this quote could be seen as a critique of the pharmaceutical industry and the over-prescription of medication. It could also be a call for more holistic and preventative approaches to health, such as healthy eating, regular exercise, and stress management, rather than relying solely on medication.

In terms of personal development, this quote might be interpreted as a reminder to question the status quo and not take things at face value. Just as a good physician should question the efficacy of medicines, we should also question the effectiveness of our habits, beliefs, and routines. It suggests that we should be discerning and critical, rather than blindly accepting things as they are. This could lead to more effective and meaningful personal growth and development.