This text is quoted from the book Oneness in Duality, by Erika Dias and Pierre Wittmann, published by Wisdom Gift Publications in 1993. Literally duality is the coexistence of two things of different nature, but actually it is the process of differentiation. From the differentiation of two things, the ten thousand things are born, variety and diversity develop, and the universe expands, with its incalculable number of particles, atoms, molecules, cells, living beings, plants, rocks, mountains, rivers, seas, continents, planets, stars, galaxies all separate from each other, and separate from their creator, the mind that observes them.
Separation creates duality of subject and object.
It is obviously the opposite of duality. Oneness is the situation in which there are not two things, but only one thing, there is no differentiation, but identification. In oneness there is no diversity, no separation, no subject and object, no comparisons, no pairs of opposites, no judgements, no concepts, no relationships, no feelings and no emotions. This situation seems very different from the world we see around us, and very unlikely to ever occur to us. If we want to understand how oneness can occur, we must first discover the primordial cause of duality, and if we can suppress this cause, oneness will remain.