Chris "Fox" Wallace, in Poker Pro magazine column, January, 2009, pp. 74-75. Note: I don't usually find much to like in Poker Pro, but once in a while there something of real value. I thought this column was especially good, so I'm going to post several paragraphs from it, each as a separate entry, on consecutive days.
There are only two attitudes about poker that make sense. Either you are a recreational player and you want to have some fun and see if you are any good, or you are a serious player and you only care about making money. Anything in between the two is a recipe for disaster. Trying to have fun and casually play some cards will guarantee that you lose money, and losing money when you are trying to be serious about winning will ruin your fun.