学习数学的唯一方法就是做数学。
美联储的工作就是在派对刚开始时把酒杯拿走。
The only time you fail is when you stop trying.
'Jeff, what does Day 2 look like?' 'Day 2 is stasis. Followed by irrelevance. Followed by excruciating, painful decline. Followed by death. And that is why it is always Day 1.' To be sure, this kind of decline would happen in extreme slow motion. An established company might harvest Day 2 for decades, but the final result would still come.