The six volumes of Abu Zubaydah's diaries, published yesterday, which span more than a decade from his student years to just before his March 2002 capture, were a key element of the George W Bush administration's justification of its "war on terror."
US officials often use the accounts to justify holding prisoners at Guantanamo without charge or trial, but they had never before been made public.
Washington once considered Abu Zubaydah to be Al-Qaeda's number three leader - waterboarding him 83 times in a single month and subjecting him to other so-called "enhanced interrogation techniques" - though it later dialed back its portrayal of the suspect as a senior operative.
Al Jazeera said the documents - a copy of the government's English translation of the diaries - were obtained from a former US intelligence official who worked with the CIA and FBI on Al-Qaeda issues.
The diaries reveal Abu Zubaydah's ambivalence but also his passion over his decision to join Osama bin Laden in the early days of Al-Qaeda.
"Yesterday and only yesterday I decided to go to Afghanistan," Abu Zubaydah wrote in an entry dated January 6, 1991, in describing his intent to return to India to complete his studies after receiving training during the trip.
Al Jazeera published the first of six volumes of the diaries with plans to subsequently release the remainder.
He also acknowledged his inner conflict between seeking martyrdom and wanting family life.
"In spite of my yearning for sooner martyrdom, yet it is the truth that I am not denying; I am longing to a good wife, a small house, a child and the word 'Papa,'" Abu Zubaydah wrote.
And the diaries' value to US officials was clear in their account of key terror figures Abu Zubaydah met.
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