As a biography of David Ben-Gurion, this is not the best read - it has large gaps in various parts of his life and in later parts almost completely diverts from what actually happened to Ben-Gurion towards the general development in politics of the young State of Israel.
But that is not the point of the book, as it is more of a narrative of a protege and confidant of Ben-Gurion (and later immensely interesting and successful statesman in his own right) about his former mentor and leader. In some passages, the book focuses on Peres' own life, that is, as much as his legacy, intertwined with Ben-Gurion - this naturally prevents any critical evaluation of Ben-Gurion by Peres (except one short passage in the middle of the book, where Peres nevertheless holds his ground).
The core idea of Peres' narrative is that the uniqueness of Ben-Gurion among the Zionist leaders before him and within his generation lies in his decisiveness. My most favourite quote from the book was a passage where, before the War of Independence, Ben-Gurion talks to young Peres;
"'You know, Trotsky was no statesman'.(..)
'Why is that?'
'Because of his concept of no war-no peace. (..) That's not statesmanship. That's some sort of Jewish invention. A statesman must decide, one way or the other; to go for peace and pay the price, or to make war, knowing what the risks and dangers are. Lenin was Trotsky's inferior in terms of intellect, but he became the leader of Russia because he was decisive.'"
This is the core idea that Peres wants the readers to know about Ben-Gurion; despite all the politics in the 1950s and 60s (Lavon affair and so on), it was Ben-Gurion's decisiveness, pragmatism and grounding in Jewish tradition, before and during the war that allowed the creation of the State of Israel, through acceptation of the Partition plan and leading young state in its first war.
As long as the reader accepts the limitations and objectives set out by the name of the author, it is an immensely interesting read - a half-biography, half-memoir, venerating a man who during his whole life lived his beliefs (and particularly the singular idea of the need for a Jewish state), from growing up in a forgettable Diaspora village in Poland, through leading the small agricultural and workers' communities in the Mandate, ultimately managed to defy all the odds - creating a state and putting himself next to the greatest statesmen of the twentieth century.