Religious texts, including scripture, are texts which various religions consider to be of central importance to their religious tradition. They differ from literature by being a compilation or discussion of beliefs, ritual practices, moral commandments or laws, ethical conduct, spiritual aspirations, and for creating or fostering a religious community. Within each religion, these sacred texts are revered as authoritative sources of guidance, wisdom, and divine revelation. They are often regarded as sacred or holy, representing the core teachings and principles that their followers strive to uphold. The relative authority of religious texts develops over time and is derived from the ratification, enforcement, and its use across generations. Some religious texts are accepted or categorized as canonical, some non-canonical, and others extracanonical, semi-canonical, deutero-canonical, pre-canonical or post-canonical. "Scripture" (or "scriptures") is a subset of religious texts considered to be "especially authoritative", revered and "holy writ", "sacred, canonical", or of "supreme authority, special status" to a religious community. The terms sacred text and religious text are not necessarily interchangeable in that some religious texts are believed to be sacred because of the belief in some theistic religions such as the Abrahamic religions that the text is divinely or supernaturally revealed or divinely inspired, or in non-theistic religions such as some Indian religions they are considered to be the central tenets of their eternal Dharma. In contrast to sacred texts, many religious texts are simply narratives or discussions pertaining to the general themes, interpretations, practices, or important figures of the specific religion. In some religions (e.g. Christianity), the canonical texts include a particular text (Bible) but is "an unsettled question", according to Eugene Nida. In others (Hinduism, Buddhism), there "has never been a definitive canon".