This quote suggests that to develop a well-rounded and beneficial worldview, one should focus on the tangible and quantifiable aspects of life (represented by mathematics) rather than the abstract and often unprovable concepts found in metaphysics.

Mathematics is a discipline based on logic, precision, and proven theorems. It provides concrete solutions and is universally accepted. It represents a clear and objective understanding of the world around us. On the other hand, metaphysics is a branch of philosophy that deals with the fundamental nature of reality, including the relationship between mind and matter, substance and attribute, potentiality and actuality. It often involves concepts that are abstract, debatable, and unprovable.

By suggesting that we should “renounce metaphysics but be a good mathematician,” the quote implies that we should strive for a practical, logical, and evidence-based approach to understanding the world. This doesn’t necessarily mean completely rejecting any metaphysical or philosophical ideas, but rather prioritizing empirical evidence and logical reasoning in developing our worldview.

In today’s world, this idea could be applied in various ways. For instance, in the face of the ongoing debate between science and religion, this quote suggests that a healthy approach might be to prioritize empirical evidence (science) while still respecting and considering metaphysical beliefs (religion).

In terms of personal development, this quote could be interpreted as a call to develop critical thinking skills and to base our beliefs and decisions on evidence and logical reasoning. It encourages us to question unprovable assumptions and to strive for a clear, objective understanding of the world. This can lead to more informed decisions, a more realistic worldview, and ultimately, a more fulfilling life.