What does it mean for the courts to have a will of their own?
What does it mean for the courts to be ambitious or ambitious enough to counteract the ambitions of the other parts of government?
What does it mean for the interests of the justices or the judges on the court to be attached to the rights of that place?
This is often referred to as the Counter-Majoritarian Difficulty, this idea that in the context of democratic government or republican government, we do rely on this part of government, the courts, the members of these at the Federal level are unelected, we rely on them to check the excesses of majoritarian government.
The people themselves choose this counter-democratic brake, B-R-A-K-E, on republican government.
We need these judicial independence precisely because there come moments where democratic majorities are very interested in rolling over either the rights of the minorities or their representatives are very eager to walk past the limits placed upon them by the constitution.