When you have had even one glimpse of pure consciousness, no karma can influence you. Your frequency becomes much more than the frequency of karma. Karma can work on you only as long as you have thoughts. In conscious awareness you go beyond thoughts. So, naturally you will start ruling over karma. Any meditation when done intensely can give you a glimpse of consciousness, the Truth.
That is why they say, meditation is like exposing your film directly to the sun. If the camera shutter opens for one second, whatever is in front of the camera will be recorded on the film. If the shutter is left completely open, what will happen? If the sun’s rays directly fall on the film, what will happen? Whatever is recorded will be erased.
When you took birth, for a moment the camera shutter opened and life entered your body. Whatever was there in the scene outside at that moment was recorded. By the word ‘scene’, I mean the planetary positions at that moment. That is why the time of birth is very important. Based on that, your consciousness functions. However, during meditation, I consciously keep the shutter open for quite some time! So naturally, whatever is recorded will be erased!
So the first time the shutter was opened was when you took birth. The second time the shutter is opened is when you are initiated. This time the shutter is kept completely and naturally open so that the sun’s rays enter and wipe out all your karma. That is why when you are initiated by a master, you are called dvija or twice born. The man who operates your camera, who holds the shutter open for that period of time, is called the guru. He is the master.
source: Living Enlightenment