A letter of confidence
Baozhu Zhixin, a Chinese idiom, Pinyin is B à ozh à x à n, which means to stick to the letter. It's from Zhuangzi's stealing Zhi.
The origin of Idioms
Chuang Tzu's stealing feet: "Wei Sheng and the woman expect to live under the beam. If the woman doesn't come, the water will not go, and she will die holding the beam."
Idiom usage
Keep one's word. Examples Yu Biyun's selected interpretation of Ci Poetry in Tang, Five Dynasties and two Song Dynasties: long guarding Wei Sheng's letter of holding a pillar, reducing Shen Lang's girdle and expressing his true feelings. The sixth chapter of Hui Qiyuan's "graceful Ci" and "historical records - biographies of Su Qin": "the letter is like the end of life, and the woman is under the beam. If the woman does not come, the water will not go, and she will die holding the pillar." Tang Libai's poem "a long journey of cadres" says: "if you always hold a pillar, you can't go to the watchtower."
A letter of confidence
The mountain passes through the stone - shān liù chuān shí
follow suit without knowing why - ǎi rén kàn chǎng
look after the masses as if they were injured -- love the people - shì mín rú shāng
seek a moment 's peace however one can - gǒu qiě tōu ān