This is a short passage from the book "Quintessential Dzogchen
Sound familiar?
Peace
Tulku Urgyen Rinpoche said:The first experiences we will have at the moment of death are the sounds, colors, and lights, but these will not be vague, feeble, or limited, as they are now, but intense and overwhelming. The colors then are iridescent hues, while the lights are sharp like needle points, similar to looking directly into the sun. The colors are indications of enlightened body, the sounds indicate enlightened speech, and the lights indicate enlightened mind. That is why the Tibetan Book of the Dead reminds the dying person, "Do not be afraid of these lights. Do not fear the sounds. Do not be terrified by the colors."
In the bardo, yogis who grew somewhat familiar with Togal practice during their lives can remain unafraid, free of terror or dread, because they know that the colors, sounds, and lights, are their own manifestation--the natural displays of their buddha nature's body, s speech, and mind.
These initial manifestations are a prelude for the rest of the bardo. Ordinary people, however, become totally overwhelmed by the immensity of the displays. The sounds in the bardo are not small noises--they roar like 100,000 simultaneous thunder claps--and the lights and colors shine with the brilliance 100,000 suns. Later, when the deities begin to appear, the largest are the size of Mount Sumeru, while the smallest are no bigger than a mustard seed. These deities are vibrantly alive and dance about. Faced with the spectacle you have two options: either you panic with fright or you recognize them as your natural displays. This is why it is of incredible benefit to practice in this life so that your grow familiar with you natural displays. Otherwise, facing them in the bardo will results in deep confusion and bewilderment.
Even if you are an accomplished Buddhist scholar who knows a lot of Dharma, can debate, and all the rest, without this familiarity you will still become terrified and panic at the awesome display in the bardo. You can't debate with these deities; you can't explain them away. But if you follow the Vajrayana path and grow familiar with the unified path of development and completion, you can ensure that you recognize all this to be your own manifestation--which will be of real importance.
Sound familiar?
Peace