In this distinct and separate existence of the judicial power, in a peculiar body of men, nominated indeed, but not removable at pleasure, by the cro… - William Blackstone

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In this distinct and separate existence of the judicial power, in a peculiar body of men, nominated indeed, but not removable at pleasure, by the crown, consists one main preservative of the public liberty; which cannot subsist long in any state, unless the administration of common justice be in some degree separated both from the legislative and the also from the executive power. Were it joined with the legislative, the life, liberty, and property of the subject would be in the hands of arbitrary judges, whose decisions would be then regulated only by their own opinions, and not by any fundamental principles of law; which, though legislators may depart from, yet judges are bound to observe. Were it joined with the executive, this union might soon be an overbalance for the legislative. For which reason... effectual care is taken to remove all judicial power out of the hands of the king's privy council; who, as then was evident from recent instances might soon be inclined to pronounce that for law, which was most agreeable to the prince or his officers. Nothing therefore is to be more avoided, in a free constitution, than uniting the provinces of a judge and a minister of state.