To overcome the anxieties and depressions of contemporary life, individuals must become independent of the social environment to the degree that they no longer respond exclusively in terms of its rewards and punishments.
数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
The key to performance is elegance, not battalions of special cases.
"We have to be willing to fail, to be wrong, to start over with lessons learned."