Traditional chinese calligraphy - I Ching キーホルダー

This piece of Chinese calligraphy in cursive script is about the two hexagrams Qian and Kun. They are the foundational elements of the I Ching, the ancient Chinese book of wisdom. 易曰: 天行健, 君子以自強不息。 地勢坤, 君子以厚德載物。