Discretion is the better part of valour.
Yǒnggǎn guì hū shěnshèn.
勇敢贵乎审慎。

Distance lends enchantment to the view.
Jùlí ràng jǐngsè zēngtiān mèilì.
距离让景色增添魅力。

Do as I say, not as I do.
Zhào wǒ suǒ shuōde zuò, bié zhào wǒ suǒ zuòde lái zuò.
照我所说的做,别照我所做的来做。

Do as most men do, then most men will speak well of you.
Suísú ér xíng, zhòngrén chēng sòng.
随俗而行,众人称颂。

Do as you would be done by.
Jǐ suǒ yù shī yú rén.
己所欲施于人。

Do in Rome as the Romans do.
Rùxiāng suísú.
入乡随俗。

Do not cast your pearls before swine.
Mò bǎ zhēnzhū diū zhū qián; mò duì niú dànqín.
莫把珍珠丢猪前;莫对牛弹琴。

Do not halloo till you are out of the wood.
wèi zhēnzhèng tuōlí xiǎnjìng qián, wù zuò tuōxiǎn zhī qìng.
未真正脱离险境前,勿作脱险之庆。