This includes all the major speeches and writings of Nelson Mandela, from the formation of the ANC Youth League through his release. You can see in it Mandela's development from an African nationalist, suspicious of communism, and seeing little in common between Africans and the other oppressed peoples ("Coloureds" and Indians), much less whites, into an internationalist, strongly influenced by Marxism. It includes Mandela's testimony at his trials, in which he attempted to put the government on trial. It includes accounts of Mandela on Robben Island by two other prisoners. Then it has his correspondence with the government, requesting to meet and negotiate. Timing is everything: the South African Army had been beaten back from Angola (by combined Cuban, Angolan, and SWAPO forces), and forced to accept independence for Namibia. The mass movement had taken on the form of massive demonstrations and political strikes. In this context, approaching the government for negotiations was the correct move.
It includes the first four speeches Mandela gave upon his release, showing that his plan was not simply to negotiate, but to "intensify the struggle." This is quite important, since the movie version of Nelson Mandela: Long Walk to Freedom, in contrast to Long Walk to Freedom: The Autobiography of Nelson Mandela, makes it look like Mandela viewed the mass movement as an obstacle to negotiations. For those who want to follow up on the further speeches of Mandela in the struggle, I suggest Nelson Mandela Speaks: Forging a Democratic, Nonracial South Africa.
On the role of Cuba, and Mandela's view on it see How Far We Slaves Have Come! South Africa and Cuba in Today's World and Cuba and Angola: Fighting for Africa's Freedom and Our Own.