Because I don't trust anybody's information but my own.
5 seconds sound clip from the The Players Club (1998) movie soundboard.
You can hear this line at 00:27:50 in the DVD version of the movie.
Quote context
[...]
- Wake up!
- I am up.
- How do you expect to pass your finals if you sleep through every one of my lectures?
- How? Someone slid you a copy of the test?
- Because I don't trust anybody's information but my own.
- I haven't helped you make it this far for you to mess up now.
- Do you think you can get more rest? Good. Just don't get it in my classroom.
[...]