The songs are written from a spiritual and sometimes mystical perspective. Barletta stated that the connection between rock and spirituality is found in "the constructive rebelliousness of not accepting the concealment of Divinity in the world." He is a strictly Orthodox Jew pertaining to Chabad-Lubavitch branch of Hassidism and regards Lubavitcher Rebbe Menachem Mendel Schneerson as his spiritual teacher. In this respect, towards the end of one song (No corras más) a recording of a Rebbe's speech can be heard. Most lyrics are written by Barletta, with only a few exceptions (such as Estar en vos by Portillo). This is the reason why the language of the lyrics is strongly influenced by Jewish religious tradition, in spite of the band not being composed only of Jews. Originally, in Barletta's words, it was just a coming together of four musicians from different religious or spiritual backgrounds, and albeit two of them were Orthodox Jews (Barletta, Cohenca) and the other two Evangelical Christians during the original line-up, they never focused on their religious differences but rather on making music together. Nevertheless, the Jewish element is prevalent, as Hebrew terms are often heard in their lyrics, such as Baruch haBa (masculine for "welcome"), Beit HaMikdash (Holy Temple), tzadikim (Jewish "saints"), and Yesh Me'ayin (Jewish concept for creatio ex nihilo). Having been object of confusion, Barletta explained he is not a rabbi nor seminarist. The Haredi fashion of Barletta plus Hebrew terms and kabbalistic imagery reasonably led many to label Atzmus as Jewish. There is even a literal quote from the Mishnah in No corras más: "Who is strong? One who overpowers his inclinations" (Avot 4:1).
