"To consider the judges as the ultimate arbiters of all constitutional questions [is] a very dangerous doctrine indeed, and one which would place us under the despotism of an oligarchy. Our judges are as honest as other men and not more so. They have with others the same passions for party, for power, and the privilege of their corps. Their maxim is boni judicis est ampliare jurisdictionem [good justice is broad jurisdiction], and their power the more dangerous as they are in office for life and not responsible, as the other functionaries are, to the elective control. The Constitution has erected no such single tribunal, knowing that to whatever hands confided, with the corruptions of time and party, its members would become despots. It has more wisely made all the departments co-equal and co-sovereign within themselves." --Thomas Jefferson to William C. Jarvis, 1820. ME 15:277
"The question whether the judges are invested with exclusive authority to decide on the constitutionality of a law has been heretofore a subject of consideration with me in the exercise of official duties. Certainly there is not a word in the Constitution which has given that power to them more than to the Executive or Legislative branches." --Thomas Jefferson to W. H. Torrance, 1815. ME 14:303
"But the Chief Justice says, 'There must be an ultimate arbiter somewhere.' True, there must; but does that prove it is either party? The ultimate arbiter is the people of the Union, assembled by their deputies in convention, at the call of Congress or of two-thirds of the States. Let them decide to which they mean to give an authority claimed by two of their organs. And it has been the peculiar wisdom and felicity of our Constitution, to have provided this peaceable appeal, where that of other nations is at once to force." --Thomas Jefferson to William Johnson, 1823. ME 15:451
"But, you may ask, if the two departments [i.e., federal and state] should claim each the same subject of power, where is the common umpire to decide ultimately between them? In cases of little importance or urgency, the prudence of both parties will keep them aloof from the questionable ground; but if it can neither be avoided nor compromised, a convention of the States must be called to ascribe the doubtful power to that department which they may think best." --Thomas Jefferson to John Cartwright, 1824. ME 16:47