I’ve just started reading Hitch 22: A Memoir by Christopher Hitchens. I was very taken by the sentiment in this paragraph.
If there is anybody known to you who might benefit from a letter or a visit, do not on any account postpone the writing or the making of it. The difference made will almost certainly be more than you have calculated.
oddrops 
I disagree with Hitchens on a lot of things, but on this, I think he’s right on!