Extracted from the website of Buddhist Vajrayana Charity Funds Association and translated (空 性) into English:

Emptiness

From the perspective of religion, it is the complete constraint-free situation with eradication and removal of all desire, longing, anxiety, and even impermanence. 

From the perspective of philosophy, it is the selflessness of phenomena (remark: the absence of any intrinsic identity (self) in dharmas, i.e., things and events/the lack of an inherently existing 'mine'), the absence of intrinsic nature, the ultimate emptiness and stillness. 

The two themes of Mahayana Buddhism are:
1.	The vast Bodhicitta, being the limitless wish to provide salvation for all sentient beings of the universe. The vast compassionate wish, to the extremity of Great Compassion.
2.	The doctrine of Profound Wisdom, being the wonderful theory of non-difference between emptiness and existence, derived from the ultimate state of emptiness of all dharmas, to the extremity of Great Wisdom.

Compassion (emotion and feeling) and Wisdom (reasoning and wisdom) develop into the ultimate state and merge into one entity, owing to the Compassionate Heart at Cause Level attaining the Wisdom at Effect Level. Having attained wisdom, in turn generates the eternal Vow of Compassion Practice. Hence, Bodhisattvas, who enter our world with their vow of practice to promote salvation to others, are the manifestation of wisdom attainment derived from the ultimate state of emptiness of all dharmas.

The three-step procedure to generating Great Wisdom:
(1)	To achieve the correct understanding on the doctrine of Great Wisdom Emptiness — The Differentiation Wisdom.
(2)	To achieve the certified entry of the exact matching quantity from the realisation of Great Wisdom Emptiness — The Present Certified Wisdom.
(3)	To achieve the certified acquisition of the ultimate perfection from the wonderful meaning of Great Wisdom Emptiness — The Perfection Wisdom.

The wisdom of Great Wisdom is not solely the achievement of comparative thinking (Inference), but requires the certified acquisition of the exact present quantity direct intuition of wisdom.