Democritus, only knowledge obtained through the intellect was legitimate. In one of the earliest recorded statements of a viewpoint that would establish the primacy of reason over the senses for millennia, he says: “Of knowledge there are two forms, one legitimate, one bastard. To the bastard belong all this group: sight, hearing, smell, taste, touch. The other is legitimate, and separate from that.”18 One result of this emphasis on the power of the mind was an ever-increasing reliance on conclusions reached through the rigorous application of systematic thought.