This one is about misunderstanding purpose. The beginning 4 lines say "Residing within the holy people, I become prone to what's natural. If my intentions are truly evil, then there is nothing good in the world." The meaning is: I as a Christian live with/among other believers. Because of this, I become likely to do what is natural, and that would be making the mistake of overdoing the preaching of the gospel. If simply spreading the word about Christ is evil to the world, what is there that is truly righteous in the world?
The next 4 lines more so address the process of overdoing it too much. If we take a step too far by shoving the word down their throats, forcing it upon them, then we clearly have forgotten the true purpose of spreading the word. By losing sight of the true purpose of our calling, we unknowingly strike fear in non-believers' hearts, discouraging them.
The chorus says "What is there within us? Penance, is it enough? How can there be salvation when there is no compassion?" Now, by penance, I do not mean bodily harm. I mean it in a way of compensation for wrongs committed, asking myself if it will even be enough to cover the act of forcing the word on the people. The scriptures should never be forced on anyone. And if there is no compassion for those that refuse to listen, how can there be salvation at all for them?
The next verse addresses a sense of weakness and doubt. Once we as Christians have given it all our effort and knowledge, and the people still refuse to listen to the gospel, what more can be done but to stand back and watch as they slowly die? I do not mean dying physically, but spiritually and morally. In the same verse, I almost in a sense am attacking my own question. It is an unfaithful and doubting question. I admit that it is a weakness, sometimes forcing me inevitably as a sinning human being to commit a lot of the same acts that I am preaching against. And then I am judged by the very people that taught me how to judge in the same way. Granted, it is hypocritical, but no matter what, all Christians are still called to preach the gospel. We're also called to repent and turn away from sin. Sometimes even us believers mess up and make mistakes, the very mistakes we object to. Sometimes we get off on the wrong track and begin living blindly with a confused sense of righteousness.
The bridge says "I'd rather be a murderer that believes than live on as a man who walks blindly." This may sound a little harsh or startling at first, so I will explain. It is basically an admittance of humility, saying that I would rather be like a lowly criminal that has faith in Christ than a believer who continues living on with a sense of blurred and confused purpose.