For Obama

and his love of books. He said books were his secret to surviving The White House Years. 
Here is an excerpt from the interview with Michiko Kakutani, the chief book critic for the New York Times:

"That period in New York, where you were intensely reading.

I was hermetic — it really is true. I had one plate, one towel, and I’d buy clothes from thrift shops. And I was very intense, and sort of humorless. But it reintroduced me to the power of words as a way to figure out who you are and what you think, and what you believe, and what’s important, and to sort through and interpret this swirl of events that is happening around you every minute."

Here's the link to the interview, in case you are interested.
Transcript: President Obama on What Books Mean to Him