Excerpt from The Harvard University Press:
There’s only one way to proceed. Go inside yourself. Explore the reason that compels you to write; test whether it stretches its roots into the deepest part of your heart, admit to yourself whether you would have to die if the opportunity to write were withheld from you. Above all else, ask yourself at your most silent hour of night: must I write? Dig inside yourself for a deep answer. And if the answer is yes, if it is possible for you to respond to this serious question with a strong and simple I must, then build your life on the basis of this necessity; your life, even at its most indifferent and attenuated, must become a sign and a witness for this compulsion.
Read the full here.