What idea about government did the Founding Fathers include in the Preamble to the Constitution?

Base on the question which ask to states the idea about the government did the Founding Father that include in the Preamble to the Constitution, and base on my research, the Articles in the constitution explains all government procedures. They are divided within the three branches which are the Executive, Legislative, and Judicial. The Preamble to the Constitution promotes unity, justice and prosperity