The above quote from Calvin and Hobbes creator Bill Watterson is a nice reminder that most of us have no idea what we're doing or where we're heading. Sure, everyone likes to have a plan, but it's not always possible or necessary to actually get there.
Watterson's quote comes from a commencement speech to the 1990 graduating class at Kenyon College:
I tell you all this because it's worth recognising that there is no such thing as an overnight success. You will do well to cultivate the resources in yourself that bring you happiness outside of success or failure. The truth is, most of us discover where we are headed when we arrive. At that time, we turn around and say, yes, this is obviously where I was going all along. It's a good idea to try to enjoy the scenery on the detours, because you'll probably take a few.
For all the meticulous life-planning most of us like to do, it's a good reminder that more often than not those detours are worth taking a look at.