...of the moment
"Only a fool trips on what is behind him."
--Anon. Just heard it for the first time, on some NFL Xbox ad. It's a little trite, but I like it as a more concise version of the story about the monk berating the other monk for having broken taboos by carrying a woman across a river, and the other monk asks "I set her down at the river bank; why are you still carrying her?"
I remember being so impressed that gmail was smart enough to figure out "reply" doesn't generally mean "reply to myself", even if the last message in a thread was also by you.