"Whether understood ultimately in Christian or Buddhist terms, however, Eliot's experience of the void in the middle of human relations is better understood initially as the basis of his mysticism -- from 'Silence' to 'The Waste Land', and beyond."
"The Waste Land's Mystical Void"
in 'T.S. Eliot: Mystic, Son, and Lover'
by Donald J. Childs, pp. 107-127
an insightful perspective
ps - the post goes better with this subject line - so