HELLPPP ME PLEASE! ONE SENTENCE WILL DO! Why was this diary written? (What is its purpose, and what makes you think so?)

Diary of Robert Peary
Robert Peary was an American explorer and United States Navy officer who made several
expeditions to the Arctic in the late 19th and early 20th centuries. He is best known for claiming
to have reached the geographic North Pole with his expedition on April 6, 1909.
From Wikimedia Entry
Scope and content: Explorer Robert E. Peary was obsessed with becoming the first person to
reach the North Pole. Peary claimed that he and his party reached the North Pole on April 6,
1909. Doubt was cast on this claim almost immediately. Some experts maintain that Peary may
have missed the Pole by as much as 50 miles, while others disagree. Individuals seeking to verify
Peary’s claim are drawn to his own records of the polar expeditions. During his earlier polar
expeditions, Peary devised a relay system of crossing great distances over the ice: trailblazing
parties would carry provisions, forge a trail, build igloos, then turn back at varying intervals,
enabling the main party to travel faster and lighter. This diary entry reflects the obsession that
drove Peary for more than 23 years