My father often says "There is money in horses, I know I put it there".
The other quote my mother says a lot is from a thoroughbred owner who said "Don't play the game in short pants". Which is a nice way of saying don't play games of risk and be upset when things turn out badly.
I always loved the quote from Invisible man "Play the game but don't believe it"
Horse quotes I always liked the quote from "the cowboys" a John Wayne film "Keep your mind in the middle".