|quote=Indeed, Isaac Newton, Johannes Kepler, William Gilbert, John Ray, and many other prior scientific luminaries freely mixed matters of supernatural and natural causation.}}</ref>|group=note}} A ''primary cause'' was meant to be a ''first cause'' to explain singularities.<ref name="skeptics">{{Cite book
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|quote=Indeed, Isaac Newton, Johannes Kepler, William Gilbert, John Ray, and many other prior scientific luminaries freely mixed matters of supernatural and natural causation.}}</ref>|group=note}} A ''primary cause'' was meant to be a ''[[First Cause|first cause]]'' to explain singularities.<ref name="skeptics">{{Cite book