Supposing you want to fully understand how a machine really works, for example a car, you first have to read about cars and gain knowledge about how they work. This alone is not enough to fully understand the mechanics of a car. You also need real hands on experience. Then you can visit a car repair shop or a car assembly plant to learn more. If you are really adventurous you can even get an old car and take it apart and then put it back together again.
In the same way if you want to understand how your own "machine" (body and mind) works reading Dhamma alone may not be sufficient. This will give you knowledge but not wisdom. To gain wisdom you really have to examine deeply, taking apart this whole "machine" piece by piece. This is what we do in meditation.
Our "machines" are constantly at work making karma. So if we gain enough knowledge and wisdom through meditation to fully understand how this "karma machine" works, we may eventually able to stop this "machine."