“Don't make a hasty movement. Be like a mountain. Move silently and cautiously.”
It’s by Yi Sun Shin, one of Korea’s greats.
Thank you.
The original quote is in Classical Chinese, the literary language used in Korea at the time:
勿令妄動 靜重如山 (물령망동 정중여산)
Translated to Korean, it would be:
가벼이 움직이지 말라, 태산과 같이 무거이 행동하라.