— C. S. Lewis, The Weight of Glory, page 139
Lewis is arguing against scientific materialism from a Christian dualist point of view: if minds are nothing but material interactions they cannot have any subjective meaning (there can be no self to which they can mean anything).
He is right about the necessity of a Self to ascribe meaning to experience; however, in Eastern Non-dualist philosophy individual minds have no significance or existence, only a single Mind can have significance or existence. There is no reason for this single Mind to be considered distinct from the 'material' world. There is no need for dualism.
In ancient Greece the leaves of the sacred grove of Dodona were said to produce oracular utterances through the rustling of their leaves in the wind. But who can say who is speaking? The wind might say that the leaves are speaking, and the leaves might say that the wind is speaking. The priests of the masculinist classical period would say that Jove was speaking. But the oracle was originally considered the voice of the Goddess Gaia: the Earth, or the entire material world, Itself.
Read about Dodona:http://en.wikipedia.org/wiki/Dodona