Not since Lincoln has there been a president as fundamentally shaped — in his life, convictions and outlook on the world — by reading and writing as Barack Obama.

Last Friday, seven days before his departure from the White House, Mr. Obama sat down in the Oval Office and talked about the indispensable role that books have played during his presidency and throughout his life — from his peripatetic and sometimes lonely boyhood, when “these worlds that were portable” provided companionship, to his youth when they helped him to figure out who he was, what he thought and what was important.

During his eight years in the White House — in a noisy era of information overload, extreme partisanship and knee-jerk reactions — books were a sustaining source of ideas and inspiration, and gave him a renewed appreciation for the complexities and ambiguities of the human condition.

“At a time when events move so quickly and so much information is transmitted,” he said, reading gave him the ability to occasionally “slow down and get perspective” and “the ability to get in somebody else’s shoes.” ...