Non-duality is the recognition that apparent opposites — subject and object, self and other, inner and outer — are not fundamentally separate but expressions of a single, undivided reality.

“When you make the two into one, and when you make the inner like the outer and the outer like the inner, and the higher like the lower, and when you make male and female into a single one, so that the male will not be male nor the female be female… then you will enter the kingdom.” — Jesus, The Gospel of Thomas, Saying 22