虛懷若谷

From Tao Te Ching, Chapter 15:

敦兮，其若樸，曠兮，其若谷。 [Traditional Chinese poetry, trad.]

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敦兮，其若朴，旷兮，其若谷。 [Traditional Chinese poetry, simp.]

From: Tao Te Ching, 4^th century BCE

Dūn xī, qí ruò pǔ, kuàng xī, qí ruò gǔ. [Pinyin]

Simple and natural like the uncarved block;
Vacant and deep like a valley.

Alternatively, from Chapter 41:

上德若谷。 [Traditional Chinese poetry, trad. and simp.]

From: Tao Te Ching, 4^th century BCE

Shàngdé ruò gǔ. [Pinyin]

The great virtue resembles the valley.

Where Wang Bi annotated,

不德其德，無所懷也。 [Literary Chinese, trad.]
不德其德，无所怀也。 [Literary Chinese, simp.]

Bù dé qí dé, wú suǒ huái yě. [Pinyin]

The truly virtuous ones do not regard his virtue as a possession; thus he harboured nothing within.

虛懷若谷

1. (figurative) modest and open-minded