Many people believe that when the body disintegrates at death, the continuum of the mind ceases and the mind becomes non-existent, like a candle flame going out when all the wax has burned.
There are even some people who contemplate committing suicide in the hope that if they die their problems and sufferings will come to an end. These ideas, however, are completely wrong.
As already explained, our body and mind are separate entities, and so even though the body disintegrates at death, the continuum of the mind remains unbroken. Instead of ceasing, the mind simply leaves the present body and goes to the next life.
For ordinary beings, therefore, rather than releasing us from suffering, death only brings new sufferings. Not understanding this, many people destroy their precious human life by committing suicide.
We can gain an understanding of past and future lives by examining the process of sleeping, dreaming, and waking, because this closely resembles the process of death, intermediate state, and rebirth.
When we fall asleep, our gross inner winds gather and dissolve inwards, and our mind becomes progressively more and more subtle until it transforms into the very subtle mind of the clear light of sleep. While the clear light of sleep is manifest, we experience deep sleep, and to others we resemble a dead person. When it ends, our mind becomes gradually more and more gross and we pass through the various levels of the dream state. Finally, our normal powers of memory and mental control are restored and we wake up. When this happens, our dream world disappears and we perceive the world of the waking state.
A very similar process occurs when we die. As we die, our inner winds dissolve inwards and our mind becomes progressively more and more subtle until the very subtle mind of the clear light of death becomes manifest. The experience of the clear light of death is very similar to the experience of deep sleep.
After the clear light of death has ceased, we experience the stages of the intermediate state, or ‘bardo’ in Tibetan, which is a dream-like state that occurs between death and rebirth. After a few days or weeks, the intermediate state ends and we take rebirth. Just as when we wake from sleep, the dream world disappears and we perceive the world of the waking state, so, when we take rebirth, the appearances of the intermediate state cease and we perceive the world of our next life.
The only significant difference between the process of sleeping, dreaming, and waking and the process of death, intermediate state, and rebirth is that after the clear light of sleep has ceased, the relationship between our mind and our present body remains intact, whereas after the clear light of death this relationship is broken.
By contemplating this, we can gain conviction in the existence of past and future lives.