And, of course, in the words of the Supreme Court itself, via Chief Justice John Marshall:
From these, and many other selections which might be made, it is apparent, that the framers of the constitution contemplated that instrument as a rule for the government of courts, as well as of the legislature. Why otherwise does it direct the judges to take an oath to support it? This oath certainly applies, in an especial manner, to their conduct in their official character. How immoral to impose it on them, if they were to be used as the instruments, and the knowing instruments, for violating what they swear to support!
The oath of office, too, imposed by the legislature, is completely demonstrative of the legislative opinion on this subject. It is in these words: "I do solemnly swear that I will administer justice without respect to persons, and do equal right to the poor and to the rich; and that I will faithfully and impartially discharge all the duties incumbent on me as _____, according to the best of my abilities and understanding, agreeably to the constitution, and laws of the United States." Why does a Judge swear to discharge his duties agreeably the constitution of the United States, if that constitution forms no rule for his government? If it is closed upon him, and cannot be inspected by him?
If such be the real state of things, this is worse than solemn mockery. To prescribe, or to take this oath, becomes equally a crime.
It is also not entirely unworthy of observation that in declaring what shall be the supreme law of the land, the constitution itself is first mentioned; and not the laws of the United States generally, but those only which shall be made in pursuance of the constitution, have that rank.
Thus, the particular phraseology of the constitution of the United States confirms and strengthens the principle, supposed to be essential to all written constitutions, that a law repugnant to the constitution is void; and that courts, as well as other departments, are bound by that instrument.
, Chief Justice Marshall, Marbury vs. Madison, 5, U.S. (1 Cranch) 137, 174, 176, (1803).