计算复杂性的本质是理解什么可以被有效地计算的极限。

It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom.

"Books are the plane, and the train, and the road. They are the destination, and the journey. They are home."

使意念沉稳，任何事理都能通达；有志发愤图强，任何难事都能成功。

I don’t really have studios. I wander around around people’s attics, out in fields, in cellars, anyplace I find that invites me.