心理学的真理存在于实践经验中。
Psychological truth is found in practical experience.
对于那些没有研究过数学的人来说,有些事情似乎是难以置信的。
文学是表达无法表达之物的艺术。
Nothing is impossible, the word itself says 'I'm possible'!
The goal of mathematics is to understand the structures that underlie the phenomena we observe.