数学不是关于数字、方程、计算或算法的：它是关于理解的。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
Leadership is about making the tough decisions and standing by them.
"El pasado no es un lugar al que volver, sino una materia con la que construir."
"To write is to resist the erosion of time."
The only way to understand history is to live it.
The greatest enemy of a good plan is the dream of a perfect plan.