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.. Political power is that power, which every man having in the state of nature, has given up into the hands of the
society, and therein to the governors, whom the society hath set over itself, with this express or tacit trust, that it
shall be employed for their good and preservation of their property...
... So that the end and measure of this power, when in every man's hand in the state of nature... it can have no
other end or measure, when in the hands of the magistrate, but to preserve the member of that society in their
lives, liberties, and possessions; and so, cannot be absolute, arbitrary power over their lives and fortunes...
Second Treatise on Government - John Locke

Based on this document what is the reason for political power?