Forgive us our trespasses, as we forgive those who trespass against us

I can tell you what this doesn't mean. It doesn't mean that you won't be forgiven until you forgive everyone who ever wronged you, as I was first taught. However, it also doesn't mean that it's just filler, to be safely ignored.

In fact, the only way you can ignore it is to be perfect and require no forgiveness. If that's the case, then not only do I have nothing to say to you, but neither does Christianity. Try Hinduism or Buddhism; I hear they're looking for perfect people.

If there are any people left and you want to know what Jesus meant, just look at what he said. The Church has tried to allegorize and spiritualize his words for 2000 years, but precious few have read them and tried to follow them.

To be forgiven requires that you be willing to forgive. In that way it's just another way of saying, "Do unto others as you would have them do unto you."