2 sentences

1. 开口是银，沉默是金。

   kāi​kǒu shì yín, chén​mò shì jīn.

   Speech is silver, silence is gold.

   Source: Tatoeba

2. 沉默是金。

   chén​mò shì jīn.

   Silence is golden.

   Source: OpenSubtitles