How to use "clause" in a sentence

The clause I now read is as plainly written in the Constitution as any other of its provisions:

To the proposition, then, that slaves whose cases come within the terms of this clause "shall be delivered up", their oaths are unanimous

There is some difference of opinion whether this clause should be enforced by national or by State authority; but surely that difference is not a very material one

Again, in any law upon this subject, ought not all the safeguards of liberty known in civilized and humane jurisprudence to be introduced, so that a free man be not, in any case, surrendered as a slave? And might it not be well at the same time to provide by law for the enforcement of that clause in the Constitution which guarantees that "the citizen of each State shall be entitled to all privileged and immunities of citizens in the several States?"

The fugitive-slave clause of the Constitution, and the law for the suppression of the foreign slave trade, are each as well enforced, perhaps, as any law can ever be in a community where the moral sense of the people imperfectly supports the law itself