What idiom is used to describe the strong brushwork of calligraphy and profound insight?

Get to the point? [ rù mù sān fēn ]？ [Explanation] According to legend, Wang Xizhi wrote on the board, and when the carpenter carved it, he found that the handwriting penetrated into the board for three minutes. Describe that calligraphy is very powerful. Nowadays, the problem of metaphor analysis is very profound. [Source] Zhang Tang Huai Guanshu broke: "Jin Emperor offered sacrifices to the northern suburbs; I wish you a better version; Workers cut it; The pencil is inserted into the wood. "Lu Xun's essays vividly exposed the ugly faces of the Kuomintang reactionaries.