Where is it written in the Constitution that you may take children from their parents, and parents from their children, and compel them to fight the battles of any war in which the folly or wickedness of government may engage it?
The Constitution, in addition to delegating certain enumerated powers to Congress, places whole areas outside the reach of Congress' regulatory authority. The First Amendment, for example, is fittingly celebrated for preventing Congress from "prohibiting the free exercise" of religion or "abridging the freedom of speech." The Second Amendment similarly appears to contain an express limitation on the government's authority....This Court has not had recent occasion to consider the nature of the substantive right safeguarded by the Second Amendment. If, however, the Second Amendment is read to confer a personal right to "keep and bear arms," a colorable argument exists that the Federal Government's regulatory scheme, at least as it pertains to the purely intrastate sale or possession of firearms, runs afoul of that Amendment's protections.
Source: 1997, Concurrence, Printz v. United States
A careful physician . . . before he attempts to administer a remedy to his patient, must investigate not only the malady of the man he wishes to cure, but also his habits when in health, and his physical constitution.