Final answer:
The principle represented in the quote is separation of powers, which benefits the people by preventing the concentration of power and allowing for checks and balances.
Step-by-step explanation:
The principle represented in the quote is separation of powers. It benefits the people by preventing the concentration of power in one department and allowing each department to resist encroachments from others. This ensures a system of checks and balances and prevents any one branch of government from becoming too powerful. By dividing power among different branches, the government is designed to serve the interests of the people and protect their individual rights.