གཟུགས་ཅན་གཟུགས་རྣམས་ལ་ལྟ་བ་འདི་ནི་རྣམ་པར་ཐར་པ་དང་པོའོ། །
The fourth liberation is transcending the perceptions of form in all aspects, letting inhibiting perceptions end, and then perfecting and remaining within the scope of infinite space by ignoring various perceptions upon thinking, ‘This is infinite space.’
Perfection of wisdom, Emptiness, World systems