Life, Confucius

未能事人 焉能事鬼 未知生, 焉知死。

- 孔子

While you are not able to serve men, how can you serve spirits? While you do not know life, how can you know about death?

- Confucius (孔子, 551BC–479BC)

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References

¶ Memento mori (Latin)
Remember your mortality.