Calligraphy operates according to the same line of logic: The skills required in calligraphy come from outside of calligraphy. Su Dongpo said, "If you use up enough brushes to make a mountain, this is not precious enough; one must read 10,000 books to be truly inspired."
書法也是同樣的道理，「書之功夫，更在書外」。蘇東坡就說：「退筆如山未足珍，讀書萬卷始通神。」