Thanks guys, I do understand your guys' position on this subject. I just think that, since everyone assumes it is specifically stated in the rules, that it might as well be written in. A situation may arise where a player gets penalized, wants to see it in the rulebook and the TD is going to show him the rule on soft play. If that player legitimately did not understand the strength of his hand he is going to argue that he was not soft playing. It would be so much easier to have the rule specifically state this. That way the player has no argument.
Also, there are so many other situations where soft play is not penalized, to pick the one that requires players to know how strong their hand is, is, in my opinion a fundamental mistake for the game of poker
As you can tell, I just really don't like the idea of essentially forcing a player to understand the strength of their hand.