每一幅充满感情的肖像画都是艺术家的自画像，而不是模特的。

The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.

成功的衡量标准不仅仅是利润，还包括积极的影响。

形式化方法的美在于它们能够提供关于系统行为的绝对保证。

仇恨是缺乏想象力的表现。