早在一千三百多年前，孙过庭曾在书谱中告诫人们“趋变适时，行书为要”。
B-Time I-Time I-Time I-Time I-Time I-Time I-Time I-Time I-Time O B-Person I-Person I-Person O O B-Thing I-Thing O O O B-Person I-Person O O O O O O B-Thing I-Thing O O O O