Hòu shēng kě wèi, wǒmen zhèxiē lǎorén yào jiāyóu le.
The young are formidable; we old-timers had better step up.
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From 《论语·子罕》: Confucius said 后生可畏, 焉知来者之不如今也 — 'The young are to be respected; how do we know the next generation won't surpass the present?' A famously generous teacher's view of the young.