The moment you stop trying is the moment you start dying.
你停止尝试的那一刻，就是你开始死亡的那一刻。
唯一能阻止你的人是你自己。
"Die Kunst ist das Sich-ins-Werk-Setzen der Wahrheit."
The most profound ideas in mathematics often arise from the simplest observations.
群众从未渴求过真理，他们对不合口味的证据视而不见。假如谬误对他们有诱惑力，他们更愿意崇拜谬误。
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
预测未来的最好方法就是创造它。
The psychologist must describe, not explain.
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.