This quote, “We are not so sensible of the greatest Health as of the least Sickness,” speaks to the human tendency to take things, especially positive ones, for granted until they are lost or threatened. The ‘greatest health’ refers to a state of optimal wellbeing, not merely the absence of disease, but also a state of physical, mental, and social wellness. When we are in this state, we often don’t acknowledge or appreciate it because it is our norm, our default state.

On the other hand, ‘the least sickness’ refers to any minor deviation from our normal health state, be it a common cold or a minor injury. Even such slight disturbances in our health make us acutely aware of our bodies and their functioning. They remind us of the importance of health and the need to take care of ourselves.

This quote can be applied in various aspects of our lives and society today. In the context of personal development, it serves as a reminder to appreciate and take care of what we have while we still have it, be it our health, relationships, or resources. It encourages us to be mindful and present, to not wait for a crisis to realize the value of what we possess.

In a broader societal context, it could be interpreted as a commentary on how societies react to public health issues. Often, public health measures are not appreciated or prioritized until a crisis occurs. For instance, the COVID-19 pandemic has highlighted the importance of public health infrastructure and preparedness, something that was perhaps taken for granted before.

In conclusion, this quote is a timeless reminder of the importance of appreciation, mindfulness, and proactive care in maintaining our health and wellbeing, both on an individual and societal level.