The Constitution was written simply and clearly. It is a written document, signed by the first state representatives, and the legislatures of every state that has joined the Union since that time. This book emphasizes what it actually says. Although it was written over 200 years ago using archaic terminology, there is no real ambiguity about the meaning of the text. Read it for yourself and you decide what it means.
The Constitution is a written instrument. As such, its meaning does not alter. That which it meant when it was adopted, it means now.