This quote by Plato reflects the intrinsic relationship between what is good and what is beautiful, and the role of proportion in defining beauty. It suggests that the essence of goodness is always associated with beauty, and that beauty, in turn, is characterized by balance and proportion.

The ‘good’ here can be understood as moral goodness, virtue, or righteousness. Plato posits that such goodness is inherently beautiful. This beauty is not just aesthetic, but also intellectual and moral. It’s a beauty that transcends physical appearances and is more about the essence or the inner quality of a thing or a person.

The second part of the quote emphasizes that beauty never lacks proportion. This can be interpreted as the Greek concept of ‘symmetria’, which refers to the balanced and harmonious arrangement of parts in relation to the whole. It’s the idea that beauty arises from balance, harmony, and proportionality, whether in physical attributes, character traits, or even ideas.

Applying this concept to today’s world, we can see how it resonates in various fields. In design and architecture, for example, the most appreciated works are often those that exhibit a balance and proportion in their elements. In personal development, it suggests that a balanced and proportionate life – one where different aspects such as work, leisure, health, and relationships are in harmony – is both beautiful and good.

Moreover, in the context of character and morality, it speaks to the idea that virtues are most beautiful when they are balanced. For instance, courage is beautiful, but without the balance of wisdom, it can lead to recklessness. Similarly, generosity is a virtue, but without the balance of discernment, it can lead to wastefulness. Thus, the development of a well-rounded, balanced character can be seen as the pursuit of both goodness and beauty.

In essence, Plato’s quote invites us to strive for goodness, seek balance and proportion in all aspects of life, and to appreciate the beauty inherent in such pursuits.