"It is unconditioned since its nature
is without beginning, middle or end;
It is described as spontaneous
since it is endowed with serene Reality body;
And it is not realized thought extrinsic conditions
since it is realized by and within one's own self.
It is knowing since it realizes these three dimensions,
Loving since it teaches the path,
and potent since it can uproot the emotional distortions and suffering via its primordial Gnosis and compassion.
The first three qualities fulfill its own spiritual aim, the latter three fulfill spiritual aims of others".
From Buddha Nature, The Mahayana Uttaratantra Shastra