The Dalai Lama argues that tantric yoga trainees need to realize the emptiness of inherent existence before they can go on to the "highest yoga tantra initiation"; realizing the emptiness of inherent existence of the mind is the "fundamental innate mind of clear light, which is the subtlest level of the mind", where all "energy and mental processes are withdrawn or dissolved", so that all that appears to the mind is "pure emptiness"… emptiness is "linked to the creative Void, meaning that it is a state of complete receptivity and perfect enlightenment", the merging of the "ego with its own essence", which Buddhists call the "clear light".
In Ven. Thubten Chodron’s 2005 interview with Lama Zopa Rinpoche, the lama noted that we "…ordinary beings who haven’t realized emptiness don’t see things as similar to illusions", and we do not "realize that things are merely labeled by mind and exist by mere name"…. "when we meditate on emptiness, we drop an atom bomb on this [sense of a] truly existent I" and we realize that "what appears true… isn’t true". By this, the lama is claiming that what we think is real — our thoughts and feelings about people and things — "exists by being merely labeled". He argues that meditators who attain knowledge of a state of emptiness are able to realize that their thoughts are merely illusions from labelling by the mind. (from Wikipedia)