and Aggression Budha the deity of Mercury and Nature Brihaspati the deity of Jupiter and teacher of the Devas Shukra the deity of Venus and worship (bhakti) and teacher of the Asuras Shani the deity of Saturn and deeds (karma) Henotheism In Vedic literature, Deva is not a monotheistic God; rather a "supernatural, divine" concept manifesting in various ideas and knowledge, in a form that combines excellence in some aspects, wrestling with weakness and questions in other aspects, heroic in their outlook and actions, yet tied up with emotions and desires. Max Muller states that the Vedic hymns are remarkable in calling every one of the different devas as "the only one, the supreme, the greatest". Muller concluded that the Vedic ideas about devas are best understood neither as polytheism nor as monotheism, but as henotheism where gods are equivalent, different perspectives, different aspects of reverence and spirituality, unified by principles of Ṛta and Dharma. Characteristics of Devas in the Vedic literature Ananda Coomaraswamy states that Devas and Asuras in the Vedic lore are similar to the Olympian gods and Titans of Greek mythology. Both are powerful but have different orientations and inclinations, with the Devas representing the powers of Light and the Asuras representing the powers of Darkness in Hindu mythology. According to Coomaraswamy's interpretation of Devas and Asuras, both these natures exist in each human being, both the tyrant and the angel. The best and the worst within each person struggles before choices and one's own nature, and the Hindu formulation of Devas and Asuras is an eternal dance between these within each person. All-powerful beings, good or evil, are called Devas and Asuras in the oldest layer of Vedic texts. A much-studied hymn of the Rigveda states Devav asura (Asuras who have become Devas), and contrasts it with Asura adevah (Asuras who are not Devas). They are born from the same father, Prajapati, the primordial progenitor; his sons are envisioned as the Asuras and Devas. They all share the same residence (Loka), eat together the same food and drinks (Soma), and have innate potential, knowledge and special powers in Hindu mythology; the only thing that distinguishes "Asuras who become Devas" from "Asuras who remain Asuras" is intent, action and choices they make in their mythic lives. Upanishads The oldest Upanishads mention Devas, and their struggle with the Asuras. The Kaushitaki Upanishad, for example, in Book 4 states