Jīnglì le zhè cì shībài, tā gǎndào xīn lǐ kōngkōngrúyě.
After this failure, he felt a complete emptiness in his heart.
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空空如也 comes from the Analects of Confucius (论语), where Confucius says of himself: 吾有知乎哉?无知也。有鄙夫问于我,空空如也 — describing a state of humble emptiness and openness to inquiry, not ignorance.