Why do calligraphers have to finish writing without thinking?

It has gone through a long process from the initial vertical seal style to the final establishment of the horizontal script style in Han Dynasty. During this period, every writer in different regions treated each work differently, and there were also repeated and individual special treatments, but this change became an obvious and inevitable trend from the statistical point of view. Sensitive to materials, sensitive to a given space, and writing purposefully without thinking are the qualities that all excellent writers or calligraphers must possess.