Children are what the mothers are.
耳濡目染，身教言传。

Choose an author as you choose a friend.
择书如择友。

Come what may, heaven won't fall.
做你的吧，天塌不下来。

Complacency is the enemy of study.
[wiki]学习[/wiki]的敌人是自己的满足。

Confidence in yourself is the first step on the road to success.
自信是走向成功的第一步。

Constant dripping wears away a stone.
水滴石穿，绳锯木断。

Content is better than riches.
知足者常乐。

Count one's chickens before they are hatched.
蛋未孵先数雏。

Courtesy on one side only lasts not long.
来而不往非礼也。

Creep before you walk.
循序渐进。

Cry for the moon.
海底捞月。

Custom is a second nature.
习惯是后天养成的。

Custom makes all things easy.
有个好习惯，事事皆不难。

Diamond cuts diamond.
强中自有强中手。

Do as the Romans do.
入乡随俗。

Do as you would be done by.
己所不欲，勿施于人。

Doing is better than saying.
与其挂在嘴上，不如落实在行动上。

Do it now.
机不可失，时不再来。

Do nothing by halves.
凡事不可半途而废。

Don't claim to know what you don't know.
不要不懂装懂。