And when he had to write a final paper for graduation, what else would he write it on but the psychology of philosophical thought?

当他要写毕业论文的时候，除了哲学思想的心理学，他不可能去写其他内容了。

That's not a new philosophical thought -- skepticism about truth.

这不是一个新的哲学思想— —对真理的怀疑。

Descartes's demon was later refined into a philosophical thought experiment called the Brain in a Vat.

笛卡尔的恶魔后来被提炼成一个名为“缸中之脑”的哲学思想实验。