This quote emphasizes the importance of not just having a strong mind, but also using it correctly. A vigorous or strong mind can be interpreted as having intelligence, knowledge, or mental agility. However, Descartes argues that these traits alone are not enough. The key lies in the correct application of these mental resources.

Let’s take the example of a highly intelligent person who uses their intelligence for harmful or destructive purposes. While they may have a vigorous mind, they are not applying it in a way that is beneficial or ethical. According to Descartes, this is not the right use of a vigorous mind.

On the other hand, someone might not be conventionally intelligent or knowledgeable, but if they apply their mind in a way that is kind, thoughtful, and beneficial to others, they are using it rightly. They are using their mind to its best potential, regardless of how ‘vigorous’ it might be.

In today’s world, this idea is highly relevant. We live in a society that values intelligence, often measured through things like grades, degrees, or job titles. However, this quote reminds us that intelligence alone is not enough. It’s about how we use our intelligence that truly matters.

In terms of personal development, this quote could serve as a reminder to not just focus on gaining knowledge or improving our mental agility. We should also focus on improving how we use our minds – how we make decisions, how we treat others, how we contribute to society. It’s about using our minds in a way that aligns with our values, that benefits others, and that makes a positive impact on the world.