不言而喻

From Mencius:

君子所性，仁、義、禮、智根於心，其生色也睟然，見於面，盎於背，施於四體，四體不言而喻。 [Traditional Chinese poetry, trad.]

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君子所性，仁、义、礼、智根于心，其生色也睟然，见于面，盎于背，施于四体，四体不言而喻。 [Traditional Chinese poetry, simp.]

From: Mencius, c. 4^th century BCE, translated based on James Legge's version

Jūnzǐ suǒ xìng, rén, yì, lǐ, zhì gēn yú xīn, qí shēngsè yě suìrán, jiàn yú miàn, àng yú bèi, shī yú sìtǐ, sìtǐ bùyán ér yù. [Pinyin]

What belongs by his nature to the superior man are benevolence, righteousness, propriety, and knowledge. These are rooted in his heart; their growth and manifestation are a mild harmony appearing in the countenance, a rich fullness in the back, and the character imparted to the four limbs. Those limbs understand to arrange themselves, without being told.

不言而喻

1. to go without saying; to be self-evident