Kàndào zhè piàn zhuànglì de jǐngsè, jìngwèi zhī qíng yóurán'érshēng.
Seeing this magnificent scene, a feeling of awe welled up unbidden.
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From Su Xun's (苏洵) 《族谱引》 (Song dynasty): reading the genealogy, feelings of filial piety and brotherly love 油然而生 - rise up naturally, like water welling up. The idiom pictures spontaneous emotion, not deliberated feeling.