The estrangement of modern life?

...we die to each other daily.
What we know of other people
Is only our memory of the moments
During which we knew them. And they have
________changed since then
To pretend that they and we are the same
Is a useful and convenient social convention
Which must sometimes be broken. We must
________also remember
That at every meeting we are meeting a stranger.

~T.S. Eliot, The Cocktail Party