British author and travel writer Andrew Sanger tweeted this a few days ago:
Good ideas are like dreams. If you don’t write them down at once, they slip away and cannot be found again.
I think that there’s a great deal of truth to this. I’ve found that it is very important to try to capture worthy ideas (and notable dreams) as quickly as possible. I would add, however, that sometimes, very stubborn ideas do come back…during a jog, in the middle of another dream, or in a variety of unexpected contexts. So don’t despair if you think that you may have “lost” a promising thought. But do try to write it down as soon as you can!