The Buddha says:

For the sake of the Buddha Path,
I, in incalculable lands,
From the beginning until now,
Have broadly preached the scriptures,
But among them,
This scripture is first.
If there is anyone who can hold it,
Then he holds the Buddha body.

The Buddha body is the Dharma body, the dharmakaya, ultimate reality. We cannot confine the true nature of the Buddha into the space of eighty years, into the framework of a country with a population of 500 million, into the small space and small time of the historical dimension. The Buddha is always present throughout the trichiliocosm in an infinite, incalculable number of transformation bodies. And just as the Buddha manifests in various forms in the historical dimension but his true body, the dharmakaya, abides in the ultimate, we too exist in the historical dimension but at the same time we have a Dharma body in the ultimate dimension. Our historical body has a beginning and an end, and we experience the cycle of birth, old age, sickness, and death. But our Dharma body is indestructible. So while in living in our historical body we practice being in touch with our Dharma body, because when we can touch the nature of our Dharma body – the ultimate dimension – we are no longer afraid of birth and death.