Mental activity is the organism's dialogue with its environment.
心理活动是有机体与其环境的对话。
物理学的美在于它能够用简单而优雅的理论解释复杂的事物。
The only thing that is constant is change.
作家必须是一个永远的初学者，总是怀疑，总是探索。
"The past is a foreign country; they do things differently there."
拓扑学是对图形在任何变形下保持不变的性质的研究。
The writer’s loyalty must be to literature, not to ideology.