我思，故我在。

I think, therefore I am.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
=2 思 sī
  1. to think
  2. to consider
=2 思 sāi
  1. (obsolete on its own in Standard Chinese) alternative form of 䰄 (“heavily bearded”)
  2. alternative form of 䰄 (“heavily bearded”)
3 故我 gùwǒ
  1. one's old self
  2. one's original self
  3. what one has always been
4 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)