 The notion of a universal principle of natural order is by no means unique to the Vedas, and "Ṛta" has been compared to similar ideas in other cultures, such as Ma'at in Ancient Egyptian religion, Moira and the Logos in Greek paganism, and the Tao.Due to the nature of Vedic Sanskrit, a term such as "Ṛta" can be used to indicate numerous things, either directly or indirectly, and both Indian and European scholars have experienced difficulty in arriving at fitting interpretations for "Ṛta" in all of its various usages in the Vedas, though the underlying sense of "ordered action" remains universally evident.In the Rigveda, the term "Ṛta" appears as many as 390 times, and has been characterized as "the one concept which pervades the whole of Ṛgvedic thought".