Separation of powers

"Two conditions are essential for an absolute independence of powers. First, that the source from which they emanate is one; second, that they all exert upon each other reciprocal vigilance. The people would not be sovereign, if one of the constituted powers that represent them, did not emanate immediately from them; and there would be no independence if one of them was the creator of the other. Give the legislature, for example, the right to appoint members of the executive power; it will exert on them a fatal influence, and political liberty will no longer exist. If the legislature appoints the judges, it would influence the judgments and there would be no civil liberty. Thus in England, where the executive power exerts a marked influence on the legislature, political liberty is considerably diminished. The judicial power, whatever appointed by the executive, is immune from its fatal influence because the people compose the jury and the judges are irremovable; so civil liberty has not yet received almost no attack."

"It is important, likewise, that the habits of thinking in a free Country should inspire caution in those entrusted with its administration, to confine themselves within their respective Constitutional Spheres; avoiding in the exercise of the Powers of one department to encroach upon another."

"In all tyrannical governments the supreme magistracy, or the right both of making and of enforcing the laws, is vested in one and the same man, or one and the same body of men; and wherever these two powers are united together, there can be no public liberty."

"To admit then a right in the House of Representatives to demand, and to have as a matter of course, all the Papers respecting a negotiation with a foreign power, would be to establish a dangerous precedent. It does not occur that the inspection of the papers asked for, can be relative to any purpose under the cognizance of the House of Representatives, except that of an impeachment, which the resolution has not expressed. I repeat, that I have no disposition to withhold any information which the duty of my station will permit, or the public good shall require to be disclosed: and in fact, all the Papers affecting the negotiation with Great Britain were laid before the Senate, when the Treaty itself was communicated for their consideration and advice. The course which the debate has taken, on the resolution of the House, leads to some observations on the mode of making treaties under the Constitution of the United States."

"The accumulation of all powers, legislative, executive, and judiciary, in the same hands, whether of one, a few, or many, and whether hereditary, self-appointed, or elective, may justly be pronounced the very definition of tyranny."

"Democratic and aristocratic states are not in their own nature free. Political liberty is to be found only in moderate governments; and even in these it is not always found. It is there only when there is no abuse of power. But constant experience shows us that every man who has power is inclined to abuse it; he goes until he finds limits. Is it not strange, though true, to say that virtue itself has need of limits?. To prevent this abuse, it is necessary that, by the arrangement of things, power shall stop power. A government may be so constituted, as no man shall be compelled to do things to which the law does not oblige him, nor forced to abstain from things which the law permits."