The justices of the Supreme Court have been applying and interpreting our Constitution since the late 18th century.
At times, they have overturned a law that didn’t follow the Constitution. At times, the Constitution may be changed or amended so the justices’ decision is reversed. And at times, the justices may reverse their own decisions.
Supreme Court decisions usually rely on precedents, or decisions that have come before. But not always. Notable justices are those who have written opinions that reinforce or reverse important precedents. In this regard, you can think of their opinions as voices in a conversation through time.