Amature, Professional or Master?

I saw this quote in a sig — but it was on a German forum and I was reading via Google translator so I’m not sure the original wording.  But I love the quote, if you know where it comes from originally let me know!

• Amateurs worry about their gear
• Professionals worry about the profit
• Masters worry about the light

I recognize myself in that first one!  🙂  But I’m trying to think about light more — people in the street must find me strange when I suddenly stare at the palm of my hand, but I’m looking at how the light is falling on it.  Palms being a good substitute for faces when it comes to exposure.   Here in the city in autumn there are often interesting effects as the sun low in the sky reflects from glass walled buildings, sometimes once or twice, to produce natural cross lighting.