Once a man was zoche to own the Mona Lisa. He wanted to be in a position to fully appreciate all the qualities of the painting. And so he studied - he learned about the history of painting, the Renaissance, the biography of Leonardo DaVinci. Then he moved on to learning about other paintings in order to appreciate the Mona Lisa better.
A friend came by and told him he was doing the wrong thing. "What if you find that you like some other painting better? What if you are looking at the painting one day and you find yourself thinking "The Mona Lisa is nice, but the color in Van Gogh's Starry Night is nicer"? And your study of painting techniques might lead you to mistakenly think that the painting could have been done better. The best approach to fully appreciating the Mona Lisa is to avoid any interaction with other paintings and restrict yourself to the Mona Lisa alone.