We get more dangerous as we accumulate knowledge, and that's both a sadness and something to control, try to learn to live with, make terms with.
You don't go around grieving all the time, but the grief is still there and always will be.
But it is nice to know that you have other races lined up, because sometimes you can get so focused on your next marathon that it can become kind of unhealthy in some ways. So it's nice to have something else to slap you in the face and say, all right, there is life after the Olympics.