当下总是看不见的，因为它是环境，而我们是鱼。
Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life. Because almost everything - all external expectations, all pride, all fear of embarrassment or failure - these things just fall away in the face of death, leaving only what is truly important.
Abstraction is the key to managing complexity in large software systems.