Knowledge is only useful if it’s applied.
The study of heuristics reveals how we make quick, efficient decisions, but also how these shortcuts can lead to systematic errors.
History is neither written nor made without love or hate.
The world owes all its onward impulses to men ill at ease; the happy man inevitably confines himself within ancient limits.
The desire for recognition is a fundamental human need.
The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
出自汉·桓宽《盐铁论·殊路》。镂：雕刻。如果没有内在的工夫，而只学习其表面，即使有再好的老师和朋友，也还是如同在油脂上作画、在冰上雕刻一样，只是浪费时间和功夫。