This peculiar passage does not quote Jesus as saying "your sins are forgiven" as He does so many times. In fact it says that she is loosened from the bounds of Satan. Not all illnesses nor healings are presented this way. We should not assume, we should approach from a preparatory base of prayer and fasting. Many say "why pray" or "why fast". It is precisely because we don't know what is ahead of us and we just can't simply assume that we know.
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