This quote underscores the value of practical, hands-on skills and the application of knowledge. "Idle learning" refers to acquiring knowledge or information without putting it into practice or using it for any productive purpose. Thoreau suggests that this kind of learning is a reproach, or a source of criticism or disappointment. His mention of learning to split wood is a metaphor for learning practical skills that can be applied in everyday life, thus making the learning valuable and meaningful.

In a broader sense, this quote also reflects a critique of purely academic or theoretical learning that doesn’t translate into real-world application. Thoreau emphasizes that knowledge should not just be gathered for its own sake, but should be used to accomplish tangible tasks and solve real problems.

Applying this idea in today’s world, it might suggest the importance of experiential learning or ‘learning by doing’. In the context of education, for example, it could be seen as a call for more emphasis on practical, vocational skills, internships, and work-study programs that provide students with real-world experience and skills that can be directly applied in their careers.

In terms of personal development, this quote could inspire one to focus on learning that contributes to personal growth and practical life skills. This could range from learning how to cook, fix things around the house, manage personal finances, or any other skill that can be directly applied in day-to-day life. It suggests that the most valuable learning is that which can be put to use, and encourages us to continually seek out and apply knowledge in ways that benefit our lives and the world around us.