对感受者来说，生活是悲剧；对思考者来说，生活是喜剧。
Life is a tragedy for those who feel, and a comedy for those who think.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。
成功不是偶然的，它是努力、坚持、学习和牺牲的结果。
True leadership means making tough decisions with both your head and your heart.
为可持续性而战，就是为我们的未来而战。