Found on a survivalist blog:
When the people fear their government, there is tyranny; when the government fears the people, there is liberty.
When the government fears the people, there is tyranny. DHS/TSA for example.
Tyranny comes when there is fear in a relationship. Liberty comes when both sides have a clear understanding of each other, and agree to compromises necessary. Tyranny comes from fear, as one side, either the government or the people, tries to bludgeon the other side into submission.
The price of freedom is eternal vigilance.
And the vigilance must also include a mirror.