ཅིའི་ཕྱིར་རྗེས་སུ་རྟོགས་པ་དང་། རབ་ཏུ་རྟོགས་པ་ཞེས་བྱ་ཞེན།
The reason is that one cannot find anything that one could understand or fully understand, not even the smallest particle, and therefore I speak of ‘understanding’ and ‘full understanding.’ Śāntamati, this is the secret of the bodhisattvas’ mind.
Emptiness, Bodhisattvas, Perfection of Wisdom