Nature of emptiness is compassion.

It should be clearly understood that anyone who has realized the nature of emptiness experiences the spontaneous arising of bodhicitta. There is no realization of emptiness that doesn't inherently contain bodhicitta. Just like fire is hot, the nature of emptiness is compassion.

~ Yangthang Rinpoche

Look at the one who is looking.

Look at this picture, then look at your mind. Look at the one who is looking. If you see this, you are the excellent one

~ Dudjom Rinpche

Mind is empty

Mind is empty, and while being empty, it still knows or experiences. Space is empty and does not know anything. That is the difference between space and mind. Mind is similar to space in that it is insub­stantial, not material. Isn’t it quite amazing that some­thing that is insubstantial is also able to experience?

There is mind, but it is not tangible or substantial. You cannot say that there is no mind because it is the basis of everything; it is that which experiences every possible thing. You cannot say really that there is a thing called mind, and yet at the same time you can­not say that there is no mind. It lies beyond both extremes of being and not being. That is why it is said, "Not existent, since even a buddha does not see it; not nonexistent, since it is the basis of both samsara and nirvana."

~ Tulku Urgyen Rinpoche