" One of the positive side-effects of maintaining a very high degree of awareness of death is that it will prepare the individual to such an extent that, when the individual actually faces death, he or she will be in a better position to maintain his or her presence of mind. Especially in Tantric Buddhism, it is considered that the state of mind which one experiences at the point of death is extremely subtle and, because of the subtlety of the level of that consciousness, it also has a great power and impact upon one’s mental continuum. In Tantric practices we find a lot of emphasis placed on reflections upon the process of death, so that the individual at the time of death not only retains his or her presence of mind, but also is in a position to utilize that subtle state of consciousness effectively towards the realization of the path. From the Tantric perspective, the entire process of existence is explained in terms of the three stages known as ‘death’, the ‘intermediate state’ and ‘rebirth’. All of these three stages of existence are seen as states or manifestations of the consciousness and the energies that accompany or propel the consciousness, so that the intermediate state and rebirth are nothing other than various levels of the subtle consciousness and energy. An example of such fluctuating states can be found in our daily existence, when during the 24-hour day we go through a cycle of deep sleep, the waking period and the dream state. Our daily existence is in fact characterized by these three stages. As death becomes something familiar to you, as you have some knowledge of its processes and can recognize its external and internal indications, you are prepared for it. According to my own experience, I still have no confidence that at the moment of death I will really implement all these practices for which I have prepared. I have no guarantee! Sometimes when I think about death I get some kind of excitement. Instead of fear, I have a feeling of curiosity and this makes it much easier for me to accept death. Of course, my only burden if I die today is, ‘Oh, what will happen to Tibet? What about Tibetan culture? What about the six million Tibetan people’s rights?’ This is my main concern. Otherwise, I feel almost no fear of death. In my daily practice of prayer I visualize eight different deity yogas and eight different deaths. Perhaps when death comes all my preparation may fail. I hope not! I think these practices are mentally very helpful in dealing with death. Even if there is no next life, there is some benefit if they relieve fear. And because there is less fear, one can be more fully prepared. If you are fully prepared then, at the moment of death, you can retain your peace of mind. I think at the time of death a peaceful mind is essential no matter what you believe in, whether it is Buddhism or some other religion. At the moment of death, the individual should not seek to develop anger, hatred and so on. I think even non-believers see that it is better to pass away in a peaceful manner, it is much happier. Also, for those who believe in heaven or some other concept, it is also best to pass away peacefully with the thought of one’s own God or belief in higher forces. For Buddhists and also other ancient Indian traditions, which accept the rebirth or karma theory, naturally at the time of death a virtuous state of mind is beneficial. "
― Dalai Lama XIV , The Dalai Lama’s Book of Wisdom