惜墨如金　

◎ 惜墨如金 xīmò-rújīn

[(of a writer,calligrapher,painter) abstemious of his use of ink] 指绘画、做文章等不轻易落笔,力求精炼

李营丘惜墨如金。—— 宋· 费枢《钓矶立谈》