The Constitution and The Federalist

This is probably the most well-known example of the second major principle guiding the Constitution, the system of checks and balances. Similar to the separation of powers, this principle stipulates that the different branches of government have to be in agreement on major decisions and that each branch has the power to limit the power of the other branch. The idea of separation of powers would be pretty much meaningless if it did not include this as well. These two principles were designed above all else to prevent tyranny, even at the expense of effective government, or what Hamilton would call "energetic government." 

 Tyranny is unjust or oppressive governmental power. In order to prevent this from happening the founding fathers set systems in order to prevent the abuse of power. The separation of power system called checks and balances, is where the government is divided into different branches with each branch having special powers. Certain branch have power over the other in order to keep them balanced.

So basically each branch of government has the ability to check and then if necessary balance the other branches. If the declaration of Independence states that all men are created equal then why shouldn't the government be equal in making, explaining and passing laws.