Blindsight discussion

This book has these random quotes between chapters, and I thought this one was interesting and I tried to search for the original source, but couldn't find anything. Anyone know where I could find it? Or maybe it, ironically, doesn't exist?

The quote is

"If you can see it, chances are it doesn't exist"
- Kate Keogh: Grounds for Suicide

I just came across this, and also have not yet been able to find info on it.

This thread is all I’ve found as well.