A bad conscience is a snake in one's heart. 做贼心虚。
A bad workman quarrels with his tools. 拙匠常怨工具差。
A bird in the hand is worth two in the bush. 双鸟在林不如一鸟在手。
A bird is known by its note, and a man by his talk. 闻其歌知其鸟，听其言知其人。
A blind man who leans against a wall imagines that it's the boundary of the world. 坐井观天。
Absence sharpens love, presence strengthens it. 相聚爱益切，离别情更深。
A burnt child dreads the fire. 一朝被蛇咬，十年怕井绳。
Accidents will happen. 天有不测风云。
A clean hand wants no washing. 身正不怕影子斜。
A clear conscience is a soft pillow. 问心无愧，高枕无忧。
A clear conscience is a sure card. 光明磊落，胜券在握。
A clear conscience laughs at false accusations. 白日不做亏心事，夜半敲门心不惊。
A clear fast is better than a dirty breakfast. 宁为清贫，不为浊富。
A close mouth catches no flies. 病从口入，祸从口出。
A cock is valiant on his own dunghill. 夜郎自大。
A common danger causes common action. 同仇敌忾。
A contented mind is perpetual feast. 知足常乐。
Actions speak louder than words. 事实胜於雄辩。
天天励志正能量