"The Waking" and the nature of obligation

For tonight's post, I'd like you to consider the final line of Roethke's poem: "I learn by going where I have to go." What does Roethke mean by this statement, in the context of the rest of the poem?

Then, in preparation for our discussions in class, post some thoughts about how this idea of "going where [we] have to go" might apply to the theme of LeGuin's "The Ones Who Walk Away From Omelas." How does LeGuin show the importance of "going where we have to go," as opposed to going where we "want" to go?