登高履危

Explanation: Metaphor of fear and trepidation. 　　Source: "Huai Tao training": "I went Pro, the non-displaced Ping, Lu Wei-line insurance, without forgetting Yuen V, can be kept to this, no loss of their virtue." 　　Examples: Han Ting Qing Shi Tuen clouds, playing the crown toward the supreme end ribbon. ~ Foot out, look the same but Bo faint. ★ Song Guan "Xuelang Stone" poem