On the three branches of government

The magistrate in whom the whole executive power resides cannot of himself make a law, though he can put a negative on every [new] law, nor administer justice in person, though he has the appointment of those who do administer it. The judges can exercise no executive prerogative, though they are shoots from the executive stock, nor any legislative function.

James Madison in Federalist No. 47

The costs add up

What are the chief sources of expense in every Government? … The answer, plainly is, war and rebellions – the support of those institutions which are necessary to guard the body politic, against those two most mortal diseases of society.

Alexander Hamilton in Federalist No. 34

How a constitution is breached

… the executive department had not been innocent of frequent breaches of the Constitution. … The great proportion of the instances were either immediately produced by the necessities of war or recommended by Congress or the Commander in Chief. … In most of the other instances, they conformed either to the declared or the known sentiments of the legislative department.

James Madison in Federalist No. 48