This paper will present and analyze the ideological components of the doctrine of Sabino Arana, the intellectual and political father of Basque nationalism. Going directly to the sources, we will unravel the main components of his doctrine. We can see that two are the main ingredients in the construction of it: religious integrism and racism. We will verify that even the linguistic issue -the preservation of the Basque language-had to do with the preservation of ethnic purity. Such elements, closely correlated, are linked with some others. Indeed, in Arana's ideology we will also find abundant doses of xenophobia, ruralism, traditionalism, indigenism, isolationism, reactionism, anti-liberalism, anti-socialism and anti-Spanish sentiment. [ABSTRACT FROM AUTHOR]