What does the elastic clause of US Constitution say?

It says that the National Government can make any laws as long as they are "necessary and proper" to carry out powers given to it by the Constitution.

"The Congress shall have Power... To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof."
all legislative powers herein granted shall be vested in a congress of the united states.