The principles of conditioning apply equally to all species.

The only way to tell the truth is to speak without fear of the consequences.

The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.

中心地是交通和通讯线路的交汇点。

对中国国民党同志共勉，1920年1月1日

纯洁的手不需要手套来遮盖。

The future of the Internet is not about technology, it's about people.

理智是不朽的，其他一切都是有限的。