>>But you still need a source of information, otherwise it's just a matter of speculation. How do you know
>>that Jesus said those words that you quoted?
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>Because His words are Spirit and they are Life. They are eternal. They are of God. They are Truth.

So, to make a long story short, you do recognize the Bible as the infallible words of God, and that this is the source of our doctrine and judgment in matters of righteousness?
Because if you don't have a reliable source, how can you measure truth and teaching, you would be subject to tradition and opinions of other people.
Then again, we must conclude, that we are called to discriminate between right and wrong, without judging the person, but rather their actions.