He's warning us that a piece of paper isn't going to save us without people in government that believe in its principles.
The Constitution serves two purposes:
1) it sets up the structure of the government (legislative, judiciary, executive branches) with enumerated powers
2) it draws some bright lines that protect the citizen from the government (e.g., Congress shall make no law ...)
What the politicians don’t appear to understand is that the bright lines that protect us from them ... also protect them from us.
If they stay within the lines, we are obligated to follow their laws. If they step over a bright line (e.g., they decide to confiscate our arms), we have the right to abolish the government (e.g., refreshing the tree of liberty with the blood of patriots and tyrants).