Trying every day to tell the truth is hard. There are harder things, of course - arguably, living with lies and meaninglessness, living in despair is harder, but it's hardship disguised as luxury and easier perhaps to grow accustomed to, since truth is usually the enemy of custom. There are harder things than writing, being President Obama, for instance, and having to deal with House Republicans, or trying to fix the leak at the Fukushima reactor, these are harder, but writing is hard.
Prison life taught him how little one can get along with, and what extraordinary spiritual freedom and peace such simplification can bring. I remember again, ironically, that today more of us in the world have the luxury of choice between simplicity and complication of life. And for the most part, we, who could choose simplicity, choose complication. War, prison, survival periods, enforce a form of simplicity on us. The monk and the nun choose it of their own free will. But if one accidentally finds it, as I have for a few days, one finds also the serenity it brings.