"Calligraphy is an art that is easy to learn but difficult to master. As a traditional art," what is the next sentence?

Inheritance is its distinctive feature. It requires that the pen and ink have a source and the knots have rules. Unlike modern art, which can "do whatever you want"; it is true that the established rules sometimes restrict calligraphy to rigidity, but first-class The calligraphers all came out of the Dharma, "dressed in Han and Tang Dynasty costumes, and danced with the style of the times"