Like many other modern pagan traditions, Celtic Reconstructionism has no sacred texts and so personal research is stressed. In order to more fully reconstruct pre-Christian Celtic religions, many CRs study archaeology, historical manuscripts, and comparative religion, primarily of Celtic cultures, but sometimes other European cultures, as well. Celtic Reconstructionists are not pan-Celtic in practice, but rather immerse themselves in a particular Celtic culture, such as Gaelic, Welsh or Gaulish. According to Kathryn Price NicDhàna, CRs believe that while it is helpful to study a wide variety of Celtic cultures as an aid to religious reconstruction, and to have a broad understanding of religion in general, in practice these cultures are not lumped together. In addition to cultural preservation and scholarly research Celtic Reconstructionists believe that mystical, ecstatic practices are a necessary balance to scholarship, and that this balance is a vital component of any Celtic Reconstructionist tradition.