I can't remember for sure, but I think I saw this on a cup of coffee, and I was impressed enough to write it down... then today I ran across it in my notebook and thought I'd share it.
"In my career, I've found that 'thinking outside the box' works better if I know what's 'inside the box.' In music (as in life) we need to understand our pertinent history... and moving on is so much easier once we know where we've been." -- Dave Grusin
I could add that there's a risk in spending so much time understanding history that you can't move on, but there is a proper balance out there.