HOW WE CAN KNOW MENTAL STATES ARE REAL?

"Dualism is the real root of our suffering and of all our conflicts. All our concepts and beliefs, no matter how profound they may seem, are like nets which trap us in dualism. When we discover our limits we have to try to overcome them, untying ourselves from whatever type of religious, political or social conviction may condition us. We have to abandon such concepts as 'enlightenment', 'the nature of the mind', and so on, until we are no longer satisfied by a merely intellectual knowledge, and until we no longer neglect to integrate our knowledge with our actual existence.” ― Chögyal Namkhai Norbu Rinpoche