Final answer:
The Constitutional principle reflected in Montesquieu's quote about government is Separation of Powers.
Step-by-step explanation:
The Constitutional principle reflected in Montesquieu's quote about government is Separation of Powers. Montesquieu argued that the powers of government should be divided and assigned to different branches, such as the executive, legislative, and judicial branches, to prevent one branch from becoming too powerful. This system of separation of powers ensures checks and balances and promotes the effective functioning of the government.