For example, in the Prajñápáramitá Sutra it says, 'No eyes, no ears, no tongue, no nose, no tactile consciousness,' and so on. And it goes through a list of all the things that one might think to exist - all relative truths that appear to us—and points out that all of them have no inherent, substantial existence and therefore are emptiness. But while it is saying that all of these things are emptiness, it is not saying that they are nothing whatsoever.
The true nature of things, that is their emptiness, is at the same time what was taught by the Buddha in the sutras as Buddha nature or sugatagarbha, which is to say that this emptiness, which is the nature of your mind, contains within it the inherent potential or seed of all of the qualities of Buddhahood. This means that although, when you look at your mind, you do not see anything substantial, nevertheless, the mind is not absolutely nothing."
From the Tibetan "Mahamudra Upadesha" by Tipola
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