天下難事，必作於易，天下大事，必作於細。
是以聖人終不為大，故能成其大。
夫輕諾必寡信，多易必多難。
是以聖人猶難之，故終無難矣。

All difficult things in the world are sure to arise from a previous state in which they were easy, and all great things from one in which they were small.
Therefore the sage, while he never does what is great, is able on that account to accomplish the greatest things.
He who lightly promises is sure to keep but little faith; he who is continually thinking things easy is sure to find them difficult.
Therefore the sage sees difficulty even in what seems easy, and so never has any difficulties.

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Chinese Text Project Dictionary

見一葉落，而知歲之將暮。