Our Buddha-nature is not the same as dependently originated phenomena or things which are devoid of an intrinsic nature or true nature. Buddha-nature exists in and through itself—not through others. It this sense, also, our Buddha-nature is absolute. We can’t get behind it. This means that our Buddha-nature is something seemingly hidden from us which we are unable to comprehend. To be sure this is a mystery of the first order. Only a few seek to voyage to this mysterious isle because the voyage is so subtle and requires all of one’s attention for its success.
On the other hand, dependently originated phenomena like this corporeal body of ours, are dependent on a variety of causes and conditions. A thing which is the product of multiple causes and conditions, does not exist in and through itself like the Buddha-nature but, as was said earlier, exists through many causes and conditions. These same dependently originated things are emptiness (śūnyatā). Nagarjuna as a matter of fact says: “What is dependently originated (pratītyasamutpādaḥ) that we call emptiness (śūnyatā)” (M.K. 24, 18). But this emptiness is closer to being synonymous with illusion, a mere appearance of the real—but not truly real. On this score from the Lalitavistara Sutra we read:
Because he [the Tathagata] regards all things like illusion, mirage, dream, like the reflection on the moon in water, like an echo or double vision, he is called the one who knows the unfettered Dharma.
The illusion, the mirage, the dream—they are all emptiness. The world we live in including our temporal body is also emptiness insofar as it is conditioned. Even the thoughts that come before our mind’s eye are such. As ordinary human beings who have not yet entered the spiritual stream, looking for our Buddha-nature we can only manage to see the dependently originated try as we might. Our Buddha-nature eludes our attempts to grab hold of it with our thoughts. Our apprehension of it is more of a question of directly seeing it without the middleman of thoughts-about-it.