〈党员须宣传革命主义〉，在梧州对国民党员的演说，1921年10月29日至11月15日间
There is no such thing as a quality problem. There are only problems of people not doing what they are supposed to do.
"记忆是最残酷的暴君，也是最仁慈的救主。"
书是一面镜子：如果一只猿猴往里看，不太可能看出使徒的模样。
化学的语言是普遍的，它的符号被所有国家理解。
A person may cause evil to others not only by his actions but by his inaction， and in either case， he is justly accountable to them for the injury.
"El humor es una herramienta poderosa para hablar de las cosas serias."