Crowding Out the "Evil" in the Mind

One way to think about evil thoughts is to corral the mind and not let them in. Good luck with that. Or I should say, I haven't had good luck with that. My own mind is capable of conjuring up evil thoughts without much provocation at all, then blithely letting them go forth and multiply. Here's another idea. What about literally crowding out the evil with the good? What if, instead of trying to corral our minds, we filled them with so many wholesome thoughts that there was no room...