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Explanations

According to skeptics, many apparently fulfilled prophecies can be explained as coincidences, possibly aided by the prophecy's own vagueness, and others may have been invented after the fact to match the circumstances of a past event (an act termed " postdiction ").

Bill Whitcomb in The Magician's Companion observes,

One point to remember is that the probability of an event changes as soon as a prophecy (or divination) exists.... The accuracy or outcome of any prophecy is altered by the desires and attachments of the seer and those who hear the prophecy.

Many prophets make a large number of prophecies. This makes the chances of at least one prophecy being correct much higher by sheer weight of numbers.