Moreover, the only way to gain control over your mind is to understand its nature. You can never force your mind, your internal world, to change. Nor can you purify your mind, by punishing yourself physically, by beating your body. That's totally impossible. Impurity, sin, negativity or whatever else you want to call it is psychological, a mental phenomenon, so you can't stop it physically.
Purification requires a skillful combination of method and wisdom.
Don't worry about that. When you truly realize the up and down nature of your everyday life, the characteristic nature of your own mental attitude, you'll automatically want to implement a solution. It offers fantastic solutions to all your problems. The problem is that people don't understand the characteristic nature of religion, so they don't have the will to implement its methods. Consider the materialistic life.