Swami Chinmayananda writes the following:

The Śrutis have emphatically denied that the pluralistic world of minerals, mountains, trees, animals and human beings together constituting the world of multiplicity* exist even as a trace in the pure Reality.

The great seers, saints and sages have corroborated this with their personal experience. When there is no duality as the devotee and the Lord, how can the devotee say he is experiencing God?

When the dream merges [Tom: ie. dissolves and disappears] itself in the waking, how can the waker say that the dreamer is different from the waker?

So too when you transcend this place of Consciousness and wake up to the plane of God-consciousness, how can you experience duality or multiplicity? This is what all Śrutis declare.

~ Swami Chinmayananda, commentary on Aparoksanubhuti (a text by Shankara), verse 47

*Swamiji defines plurality and multiplicity as being the world of objects, such as minerals mountains trees animals and human beings. He states that not even a trace of these exist in the reality. He is following the definition of multiplicity given by the Upanishads and by Shankara when he writes this, both of whom are unequivocal that this world of multiplicity and plurality refers to the appearance of objects such as mountains trees etc, and these only appear to exist due to ignorance, and cease to appear to exist once ignorance has been removed.

When Swamiji explains that ‘not a trace’ of multiplicity exists in the reality, meaning in self-realization, when only reality is there, nothing else, no ignorance, he is also copying the language of Shankara and the Upanishads who also say ‘not a trace’ of multiplicity exists in self-realisation.