It is said that the difference between buddhas and sentient beings is like the difference between the narrowness and the openness of space. Sentient beings are like the space held within a tightly closed fist, while buddhas are fully open, all-encompassing. Basic space and awareness are innately all-encompassing. Basic space is the absence of mental constructs, while awareness is the ‘knowing’ of this absence of constructs, recognizing the complete emptiness of mind essence. Space and awareness are inherently indivisible.
Urgyen Tulku Rinpoche