This is another quote attributed to Sir William Osler, who was a renowned Canadian physician and educator in the late 19th and early 20th century. The meaning of this quote is that medicine is not an exact science that can be applied uniformly to all patients, but rather an art that requires the skill and judgment of the practitioner to tailor the treatment to each individual’s needs and circumstances. The quote acknowledges that there is a lot of variation among people in terms of their health status, genetic makeup, lifestyle, preferences, and response to therapy. The quote suggests that the physician should not rely solely on scientific facts and data, but also on their own experience, intuition, and creativity to provide the best care for each patient. The quote also implies that medicine is a dynamic and evolving field that constantly adapts to new discoveries and challenges.