text: Vaisheshika school of Hinduism, as founded by Kanada in the 1st millennium BCE, neither required nor relied on a creator deity. Later Vaisheshika school adopted the concept of Ishvara, states Klaus Klostermaier, but as an eternal God who co-exists in the universe with eternal substances and atoms, but He "winds up the clock, and lets it run its course".
  Ancient Mimamsa scholars of Hinduism questioned what is Ishvara (deity, God)? They considered a deity concept unnecessary for a consistent philosophy and moksha (soteriology).
  In the Samkhya school of Hindu philosophy, Isvara is neither a creator-God nor a savior-God. This is called one of the several major atheistic schools of Hinduism by some scholars. Others, such as Jacobsen, state that Samkhya is more accurately described as non-theistic. Deity is considered an irrelevant concept, neither defined nor denied, in Samkhya school of Hindu philosophy.
  In the Yoga school of Hinduism, it is any "personal deity" (Ishta Deva or Ishta Devata) or "spiritual inspiration", but not a creator God. Whicher explains that while Patanjali's terse verses in the Yogasutras can be interpreted both as theistic or non-theistic, Patanjali's concept of Isvara in Yoga philosophy functions as a "transformative catalyst or guide for aiding the yogin on the path to spiritual emancipation".