Congress gets away from the Gandhian understanding of the U. S. Constitution, which focuses on the direct intelligible Truth, by utilization of this single phrase, known as the "elastic clause." This clause is used to circumvent and make moot the entirety of the rest of the constitution by some in Congress. It's Orwellian double-speak to suggest that the U. S. Constitution can operate with such a phrase within it around a room of lawyers. What is "necessary and proper" is the opinion of the official. This explains why Congressmen are not known for carrying a copy of the constitution in their pocket these days, I gather. All they have to remember is "necessary and proper." Then the U. S. Supreme Court rules on its constitutionality. And who knows what a bunch of lawyers on a bench think?
Gene