Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
产品要像水一样，适应不同用户的需求。
有时候，最难的不是放手，而是学会重新开始。
On vacation go to the most remote place on your itinerary first， bypassing the cities. You‘ll maximize the shock of otherness in the remote， and then later you’ll welcome the familiar comforts of a city on the way back.
The harder you work, the luckier you get.