This quote is a metaphorical comparison between theory and life, with the colors grey and green symbolizing the difference between the two. The grey theory represents abstract knowledge, ideas, or concepts that are devoid of life, vibrancy, and practicality. They are ‘grey’ because they lack the color of real life experience, the direct touch and feel of reality.

On the other hand, the ‘green’ tree of life represents the vibrant, dynamic, and evolving nature of real life. The tree is ‘golden’ because it is precious and valuable. It’s ‘glad’ because it is full of joy, energy, and positivity. The tree of life is full of variety, unpredictability, and it presents endless opportunities for growth and learning.

Applying this quote to today’s world, it can be seen as a critique of our current education system or even our societal values which often prioritize theoretical knowledge over practical experience. We’re often judged by our degrees, our grades, the theoretical knowledge we’ve acquired, rather than our practical skills, our ability to adapt, to innovate, to deal with real life situations.

In terms of personal development, this quote could be a reminder to not just focus on acquiring theoretical knowledge, but to also gain practical experience. It encourages us to step out of our comfort zone, to take risks, to learn from our mistakes, to grow and evolve with each experience. It emphasizes the importance of being in touch with the realities of life, to be involved, to engage, to participate, rather than just being a passive observer.

In essence, this quote is a call to action for us to live life fully, to embrace its challenges and opportunities, to learn from each experience, and to grow and evolve as individuals. It’s a reminder that life is not just about acquiring knowledge, but about using that knowledge to create, to innovate, and to make a difference in the world.