In The Spirit of the Laws, how does Montesquieu aim for political moderation?

Political moderation is present in the ideas Montesquieu
puts forth in his book.  The most noticeable of these would be the idea to divide
government into branches.  Prior to Montesquieu, government had been seen as an
instrument in which power was a monolithic force.  The impact of this was that political
tyranny and excessive abuse of power was a realistic option when all power rests in one
entity.  Montesquieu’s idea of political moderation is evident in the manner in which
power is divided and cut up between separate branches responsible for different jobs and
functions in the process of governing.  In this, one sees a more moderate and almost
controlled, deliberate nature of government where power is meted out equally. 
Additionally, the extension of this concept also reflects political moderation where
each branch has the chance to limit the power of another, needing all three to work
together in a functioning system of government.  In this, Montesquieu has presented a
vision of political moderation where the propensity for excessive abuse has decreased
significantly.