What are the first three words of the Constitution that embody the idea of self-government?

The phrase "We the People" serves as a powerful declaration of the principle of self-government and is foundational to the Constitution. It emphasizes that the authority of the government is derived from the people rather than from a monarch or an elite ruling class. This opening phrase signifies that the people are the source of political power in the United States, thereby establishing a government that exists to serve and represent the interests of its citizens.

In contrast, other options reflect different concepts. "In Congress Assembled" pertains to the legislative body and its functions, while "To Form a More Perfect Union" refers to one of the goals of the Constitution, which is to improve the governance and unity of the states. "We Hold These Truths" is actually from the Declaration of Independence and focuses on the rights and principles that the nation is founded on, rather than the idea of governance by the people themselves. Thus, "We the People" encapsulates the essence of democracy and self-governance more directly than the other phrases presented.