Fred Clark has a great blog post, pointing out that, in most cases, saying “the Bible says” involves ignoring those places where the Bible says something else different from what it says in the passage you cited.
But there seems to be one exception, which the Bible is consistent about: usury, i.e. the charging of interest on loans. Fred writes:
It’s interesting, then, that this biblical clarity does not translate into Christian teaching, belief, practice or politics. “The Bible is really clear about usury,” but nearly every Christian, church, denomination, etc., clearly takes the opposite position from what the Bible really clearly says.
See also his follow-up post, “How I learned to stop clobber-texting and love George Bailey.”