"Water overflows when too full, and the moon wanes when too bright" is a proverb that has been passed down for a thousand years. Although the saying seems straightforward, a closer look reveals profound life lessons. Just as a cup of water will overflow if filled too much, the moon undergoes phases of waxing and waning, transitioning from fullness to emptiness.
When interpreted metaphorically, this proverb conveys the truth that nothing is ever truly perfect. It also serves as a reminder that we should never become too conceited or arrogant, regardless of our achievements. Otherwise, it is easy to lose one's way, and ultimately, one is the only one who suffers.
"Water overflows when too full, and the moon wanes when too bright" originates from the "Feng" chapter of the I Ching, which states, "The sun reaches its zenith and begins to set; the moon reaches its fullness and begins to wane." Essentially, once anything reaches its peak, it tends to move in the opposite direction or begin a downward spiral.