Answer:
The actual Bible verse (King James version) is "Pride goeth before destruction, and an haughty spirit before a fall." It means that the next step after being all puffed up with arrogance could be falling flat on your face. Well, according to what I know, 'Pride comes before a fall' means that one becomes over confident and stops thinking sensibly when success goes to one's head and which is a sure indication of the fact that that person is bound to suffer or face disappointment because of the wrong decisions that he or she might make. In other words too much arrogance and self pride are sure to bring bad and disappointing results. This idiom is also given as an example to prove that when a person is destined to fail or fall, which is decided by the almighty God, then no one can stop that person from taking the wrong step and making a wrong decision, despite the fact that apparently that person is not expected to do such a thing under normal conditions.
There is also the possibility that it means 'exactly' what it says, "Pride goeth, before the fall". The moment you lose pride in "whatever", it shows that you are on the way "down boy"....