Exchange of names held sacred between different religious traditions is typically limited. Other elements of religious practice may be shared, especially when communities of different faiths are living in close proximity (for example, the use of Om and Krishna within the Indian Christian community) but usage of the names themselves mostly remains within the domain of a particular religion, or even may help define one's religious belief according to practice, as in the case of the recitation of names of God (such as the japa). Guru Gobind Singh's Jaap Sahib, which contains 950 names of God. "The Divine Names", the classic treatise by Pseudo-Dionysius, defines the scope of traditional understandings in Western traditions such as Hellenic, Christian, Jewish and Islamic theology on the nature and significance of the names of God. Further historical lists such as "The 72 Names of the Lord" show parallels in the history and interpretation of the name of God amongst Kabbalah, Christianity, and Hebrew scholarship in various parts of the Mediterranean world.