Defining nonduality

[iamom]

People imagine that non-duality means perfect bliss, yet my experience of non-duality was a paradoxical fusion of all opposites: ecstasy/agony, joy/sorrow, existence/nonexistence, form/formlessness, abundance/desolation. . . Non-duality isn't the absence of things we don't like, but the presence of everything on all-levels and no-levels simultaneously.

From the What Is Nonduality? page on Nonduality.com.