当下总是看不见的,因为它是环境,而我们是鱼。
"The present is always invisible because it's environmental and we're fish."
I've never known anyone who was what he or she seemed; or at least, was only what he or she seemed.
数学不知道种族或地理边界;对于数学来说,文化世界是一个国家。
The past is a shadow that follows us, but it is up to us to decide whether it will darken our future.