This quote reflects the idea that nature is a limitless source of energy and rejuvenation. It suggests that the natural world, with its unending vitality and dynamism, has the power to renew and refresh our spirits, minds, and bodies. The phrase "We can never have enough of nature" implies an insatiable desire or need for the natural world. It connotes a sense of longing or yearning for the peace, tranquility, and harmony that nature provides.

The second part of the quote, "We must be refreshed by the sight of inexhaustible vigor," speaks to the rejuvenating and invigorating effects of nature. The term "inexhaustible vigor" refers to the limitless energy, vitality, and life force that nature embodies. This suggests that by immersing ourselves in nature, we can tap into this infinite energy source, thereby replenishing and revitalizing our own energy levels and vitality.

Applying this idea to today’s world, we can see a growing movement towards reconnecting with nature. As modern life becomes increasingly characterized by technology, urbanization, and a fast-paced lifestyle, many people are seeking ways to slow down, de-stress, and find balance. This has led to the rise of practices such as forest bathing, ecotherapy, and nature retreats, which all involve spending time in nature to improve mental and physical health.

In terms of personal development, this quote can be interpreted as a reminder to regularly immerse oneself in nature as a way of recharging and rejuvenating. This could involve simple activities such as taking a walk in the park, gardening, hiking, or even just sitting quietly in a natural setting. By doing so, we can tap into nature’s "inexhaustible vigor" and in turn, boost our own energy, creativity, and overall well-being. Additionally, spending time in nature can also foster a deeper appreciation for the natural world, which can inspire us to live more sustainably and harmoniously with the environment.