Passion as in, spending the time to look into the thoughts of the paper and spending the time to observe each student's work fairly to help the student improve on their writing. Maybe the plagiarism checker is wrong about something, and makes you skip reading through that section. But, infact the student may have laid out some interesting thoughts that should have received positive reinforcement.
Our overall discussion reminded me of this piece by Aaron Swartz aswell, thought it would be nice read to suggest: http://www.aaronsw.com/weblog/anders, the specific piece is called "Confront reality"
Edit: or the whole series is quite good http://www.aaronsw.com/weblog/rawnerve
Edit2: some wording