"Testify" is a song by Rage Against the Machine which is about misrepresentation of world events by the US media. News anchors relay lies into the homes of Americans because that's all the Americans, being empty people whose only concerns are the media's showcase of glamour and gossip, can handle. The only way for people to survive is through the opiates that they partake of every day in the form of celebrities and media. It uses the party slogan for the Oceania government in the book 1984: "Who controls the past, controls the future. Who controls the present, controls the past."
Some lyrical analysis:
"We found your weakness and it's right outside your door, now testify" - In the first part, Zack is trying to be coy about saying what he thinks the government's weakness really is. So think about it this way, what's right outside your door? The world and all the people in it. And if all those people would come together, what powerful tool of revolution we would be?
"Mass graves for the pump and the price is set" - For the mass graves part, Zack is referring to oil. In the middle eastern countries, the battle is for oil, and how that's the real cause for America's involvement over there. We want our oil supply safe, so we try to be a mediator and police officer for those countries. Mass graves? People in war die. That's what it's all about - so basically, there's all this fighting that we participate in to secure oil.
You "pump" gas, and the price constantly goes up and down with middle eastern crises.
- "Who controls the past now controls the future
- Who controls the present now controls the past
- Who controls the past now controls the future
- Who controls the present now?" - In the last part, Zack is saying that whoever is in charge now, is still, has been, and always will be, in charge. Then he asks who's controlling everything now. Almost asking if we really want it this way, or if we're going to do something to change it. (thanks, Tim - Pittsburgh, PA, for all above)