An educated electorate is the only security for liberty.
One nitpicking point however is that no constitution can perfect an imperfect humanity. No matter what safeguards are written in, some scoundrel can find a workaround.
The problem with all government is that problem Paul stated: "For all have sinned and fallen short of the glory of God." Romans 3:23.
This has been addressed by far better men. Here is one quote that I particularly like:
"But you must remember, my fellow-citizens, that eternal vigilance by the people is the price of liberty, and that you must pay the price if you wish to secure the blessing. It behooves you, therefore, to be watchful in your States as well as in the Federal Government." -- Andrew Jackson, Farewell Address, March 4, 1837
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