Fear can be a useful signal, but it shouldn't be the only voice we listen to.
最好的故事是那些为读者想象力留出空间的故事。
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。
Old minds are like old horses; you must exercise them if you wish to keep them in working order.