A Teaching on karma
"...Therefore, I repeat again and again: you must control your thoughts and feelings constantly, every minute. Always remember - if the situations which you bottle up in your mind are subject to the karmic
punishment, you create karma by just thinking about them.
It is very important to control the state of your consciousness at every moment. Your consciousness is so mobile that we never cease to marvel at your ability to create so much karma even during your prayers.
That is why you are told about the meditation practice as one of the possible ways of soothing your mind."