a free slave

So today at work the Kaizen Group and I got our Daily Dale email (which hasn't been sent to us lately for some reason), and there was one quote that we just couldn't figure out.
"Responsibility is the price of freedom." Elbert Hubbard
Since the Daily Dale topic right now is Responsibility, I read this to mean, simply, if you want freedom, you must be responsible. However, one of my fellow co-ops thought it meant that to have freedom you must give up responsibility. We spent a good amount of time discussing our thoughts on this. I'm not sure what exactly Hubbard meant it to mean, and there's lots of articles which use similar quotes and ideas, which I believe lean towards the first interpretation, but I think you can make a valid argument for either.
One of the first questions asked during our discussion, however, was "Does freedom have a price?" I couldn't help but think about Paul's words in Romans 6:
"You have been set free from sin and have become slaves to righteousness."
This says that the mountains of sin I have committed, and the many more to come, they can be washed into the sea; when I become a slave to righteousness, they no longer cast a shawdow over me. All I have to do is become a slave to righteousness!
Unfortunately, righteousness is defined as free from guilt or sin (webster.com), and no one is sinless! (Ro. 3:23) But, praise be to God! By his grace he sent his Son to be the Sacrificial Lamb for the world's sins. Whoever clothes themselves with Christ will be sinless in God's sight! To a human mind, this is unbelieveable, illogical. But that is the magnitude of God's love.
So does freedom have a price? Yes, I think so. It costs more than we could ever pay. But Christ has paid the price for us, and now we are freely justified.