Final answer:
The phrase 'for carrying into execution the foregoing powers' is critical to the principle of self-government because it grants Congress the implied powers necessary to fulfill its enumerated powers stated in the Constitution.
Step-by-step explanation:
The phrase 'for carrying into execution the foregoing powers' is critical to the principle of self-government because it grants Congress the implied powers necessary to fulfill its enumerated powers stated in the Constitution. This necessary and proper clause, also known as the elastic clause, allows Congress to make laws that are not explicitly mentioned but are essential for executing its powers. For example, laws regulating banks or establishing a minimum wage are enabled by the necessary and proper clause.