Kiri-kin-tha
Kiri-kin-tha was a Vulcan scholar and follower of Surak's teachings. 

According to Kiri-kin-tha's First Law of Metaphysics; "Nothing unreal exists." 

In 2286, shortly after being brought back from the dead, Spock took a computer memory test while he was on Vulcan and one of the questions the computer asked pertained to Kiri-kin-tha's first law. He answered the question correctly. (; )

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Vulcans
Scientists
Philosophers