A quite clear picture of Anders Behring Breivik emerges from this collection of his online posts. I thought the following quotes were reasonably representative; they are edited slightly for English usage.
These snippets portray a Geert Wilders-type of cultural conservative, very opposed to ethnocentrism as a strategy, very positive about the Vienna School, staunchly pro-Israel (which he sees as beset by militant Islam), and very hostile toward Islam—what in the U.S. is called a neoconservative. Breivik sees Islam as eventually taking over Europe via differential fertility if nothing is done, noting historical data on other areas (e.g., Turkey, Lebanon, Kosovo). Based on his reading of history, he believes that the triumph of Islam would unleash horrific repression and violence against Europeans and against all manifestations of traditional European culture. It would be the end of European civilization based on Christianity and ordered liberty.
He also has a 1500-page book, titled 2083: A European Declaration of Independence, suggesting his actions were intended to call attention to himself as a way of publicizing the book and maximizing its impact. See also the (very powerful) video below which is based on the ideas of the book. The video images strongly suggest that he identifies with historical figures like Charles Martel who fought to prevent the Muslim conquest of Europe in previous centuries. Note the many photos of Christian knights battling Islam (suggesting he sees Christianity [correctly] as a historically powerful force for the preservation of Europe rather than mainly about religious faith) and (at the very end) photos of himself in military dress and armed with automatic weapons.
In general, it must be said that he is a serious political thinker with a great many insights and some good practical ideas on strategy (e.g., developing culturally conservative media, gaining control of NGOs. and developing youth organizations that will confront the Marxist street thugs). (8/31/2016: Note to leftist idiots who quote from the previous passage [but leave out Breivik’s specific suggestions for strategy]: This is not an endorsement of his actions.) (Parenthetically, during a recent lecture tour of Sweden, I was struck by the elaborate security procedures that were taken out of fear of physical beatings by “Communists,” described to me as typically the children of leftist elites. It is no exaggeration to say that racially conscious Scandinavians feel physically intimidated.) It could well be that Breivik’s silence on Jewish hostility toward Europe and the West and his rejection of ethnocentrism (see here) are motivated by his strategic sense. Read more