Abstraction is not just about hiding details; it's about creating a clear and concise model of the problem domain.

To love and be loved is to feel the sun from both sides.

Randomized evaluations can help us understand what works and what doesn't in development.

生命太短暂，不能浪费在糟糕的书上。

Suspicion against every kind of authority grew out of this experience， an attitude which has never again left me.