The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.
La poesía es la única prueba concreta de la existencia del hombre.
Writing is a way of being in the world, a way of understanding it.
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:它是关于理解的。