"I wasn't speccing myself to become a teaching professor, but, uh, I mean, obviously all those quantities interact?  Goodness of teacher times talent of student times compatibility coefficient or something like that - though I'm speaking metaphorically, the second two quantities aren't ones we can measure.  I learned a lot from Professor Nightstar really quickly, but not all of his students learn that fast from him, and I don't learn as fast from other Professors.  And, not to brag or anything, but other students have been known to take whole hours or even days to learn subjects from Magister Sting."

"I wasn't speccing myself to become a teaching professor, but, uh, I mean, obviously all those quantities interact?  Goodness of teacher times talent of student times compatibility coefficient or something like that - though I'm speaking metaphorically, the second two quantities aren't ones we can measure.  I learned a lot from Professor Nightstar really quickly, but not all of his students learn that fast from him, and I don't learn as fast from other Professors.  And, not to brag or anything, but other students have been known to take whole days to learn subjects from Magister Sting."