Death ends a life … but it does not end a relationship, which struggles on in the survivor’s mind … toward some resolution, which it never finds.

Robert Anderson (1917-2009) American playwright, screenwriter, theater producer

I Never Sang for My Father, Act 2, Closing Monologue [Gene] (1968)
    (Source)

(Ellipses in original.) The line is also given at the beginning of Act 1, where it reads:

Death ends a life, but it does not end a relationship, which struggles on in the survivor's mind towards some final resolution, some clear meaning, which it perhaps never finds.

In the 1970 adaptation Anderson made for film, the line is given as "which it may never find."