You probably recgonize it, but if you don't, it's the last line from Peter Gabriel's Solisbury Hill; a song he supposedly wrote about his decision to leave Genesis.
My take on it is that it's a fairly positive tune about knowing something isn't a good fit for a long time and then finally making a change that's expected to work out better than what you had been doing. In Gabriel's case, he went on to have a very successful solo career, and the band he left also changed direction and had quite a bit of success as well. A good outcome all around!
The song was released when I was a child, but it was still very widely played in the mid 80s, when I was in high school and college. It grew to have real meaning for me when I was about to return to Boston after taking a semester off and living back in Guilford for six months. I learned a lot about myself, but Boston was, at least at the time, where I really belonged.
I've had that song in my head for a while now, and not just because it remains one of my favorite. I've always hated it when bloggers got all cryptic and mysterious about changes that were happening behind the scenes, and now I have to do that as well. At least for now.
Let's put it this way: I'm 42 years old, the older I get, the more I find myself in these "now or never" situations. Increasingly, I'm learning to say "now."