This quote by Henry David Thoreau suggests that the most valuable gifts we can give are not the ones that can be bought or sold, but rather the ones that come from the heart. These gifts could include love, kindness, time, or understanding, which are not marketable commodities, yet hold immense value. They are rich because of their authenticity and the genuine emotion they represent, which cannot be replicated or replaced by any material good.

The second part of the quote, "We hate the kindness which we understand," may seem paradoxical at first. However, it suggests that we often undervalue or dismiss the kindness that we understand or can easily comprehend. It could be because we take it for granted, or perhaps because it’s easier to appreciate the value of something when it’s quantifiable, like material possessions. We might also feel uncomfortable or suspicious of kindness if we feel like we understand the motives behind it, as if it’s less genuine if it’s not completely selfless.

In today’s world, this quote is particularly relevant. We live in a consumer-driven society where the value of things is often measured in monetary terms. However, Thoreau reminds us that the most precious gifts are not material, but emotional and spiritual. This can be applied in personal development, where the focus is often on gaining skills or attributes that can be marketed or monetized. However, developing qualities like kindness, empathy, and understanding can be far more enriching and rewarding in the long run.

Moreover, in the context of relationships, this quote encourages us to offer and appreciate the ‘unmarketable’ gifts of love, time, and understanding. It’s a reminder that the richest relationships are not based on what we can gain from each other in material terms, but on the genuine care and connection we share.

In conclusion, Thoreau’s quote is a call to reevaluate our understanding of value, encouraging us to appreciate and cultivate the intangible, unmarketable gifts that truly enrich our lives.