Whether you are taking a course, preparing for comps or your proposal, or working on your dissertation, things will come up that you did not plan. You can face these moments in one of two ways -- you can see them as opportunities or obstacles.
One of my favorite sayings comes from the Stoics. It is "The obstacle is the way." I actually have a coin on my desk to remind me of this. The back of the coin says the following:
The impediment to action advances action. What stands in the way becomes the way.
Embrace it or loathe it, it's there all the same. However, you get to be in charge of how you experience it. You're the boss of you.
Here's an image I love because of the image, but even more because of the story behind it.