From the ancient Greek mathematician Euclid who formulated the basis for both Greek and modern logic with his book, Elements, Kelly found the logical basis for his own system. What Kelly termed the psychology of personal constructs was laid out as a fundamental postulate (or hypothesis statement), which he used 11 corollaries to explain—in much the same way that Euclid laid out his own work. The fundamental postulate was: "A person's processes are psychologically channelized by the ways in which [he] anticipates events." This is a statement to be used for purpose of examination and hypothesis, and not as an absolute truth. Kelly was proposing a new way of looking at human beings and their actions. He stated that he wanted to provide different ways of examining the unconscious mind, and along with that the typical human behaviors such as anxiety, guilt, creativity, aggression, and depression, among others. With the use of his primary diagnostic tool, known as the repertory grid, Kelly built an entire scientific system by which to evaluate human beings and consequently through which they could evaluate themselves.
His marked departure from the school of behaviorism, again, was approaching the issue as one that meant people were not passive beings who merely reacted to either their outer or inner environment. They were scientists who systematically created ways to make an impact in the world by their actions. The underlying theme in Kelly's theory was that of change—the world is continually changing, and therefore humans are continually changing their constructs of the world.
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