Quotes of Osho on dual and non-dual

The witness, the observer, divides the world into subject and object, into the witness and the witnessed. Therefore as long as there is a witness, duality will continue. Witnessing is the last frontier of the dual world, after which the non-dual begins. But one cannot reach the non-dual without being a witness. To be a witness means that I now give up dividing the world into many. Instead I will divide it two- the witness and the witnessed. And when I have reduced the many fragments of the world to two, it will not be difficult to come to the complete unity of existence when duality will disappear, when the observer and the observed will become one and the same. If one succeeds in becoming a witness he will soon have glimpses of the one without the other, when there is neither witness nor witnessed, but only witnessing.

Osho

(Source: Krishna by Osho)