"Every book is a door to another world, a world that exists only in the imagination of the reader."

"Every book is a journey, and every journey changes you."

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

计算模型的力量不仅在于其计算能力，还在于其从特定实例中概括的能力。

Don't let yesterday take up too much of today.