who said this?

This seems to be pretty much one of those "motto" thingys that is all over the place, in various forms. Some along that line are at this previous post
http://forum.quoteland.com/eve/forums?a=tpc&s=586192041&f=099191541&m=9901956881&r=4241940981#4241940981

Time
The past is just that
It's gone it can't be changed
The future isn't yet
Nothing is sure not even the sun
The present is
It's here, we're in it
But we don't have to stay
Live in the present
But don't reside there
Live for the future
But don't bring a map
Remember the past
But don't be ruled by it
http://www.rpi.edu/~guhle/Poetry.html

"Remember the Past, Focus on the Present, Live for the Future,"
~parade theme penned by Shimeko Arkwright, a senior at Savannah High School
http://www.savannahnow.com/stories/011999/ACCparade.html

"Real generosity toward the future lies in giving all to the present."~Albert Camus.