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At the beginning of Twelfth Night, Duke says: O spirit of love, how quick and fresh art thou, That not withstanding thy capacity Recieveth as the sea, naught enters there, Of What validity and pitch soe'er, But falls into abatement and low price Even in a minute." This suggests that love is of a quick and changing nature. Momentarily it may turn around, but until then it will be full of passion and wonder and foreshadows that eventually his loves interest will switch. Not sure the line, you will have to look it up.
an exemple of forshadowing is when sebastien arives in illyria, it gives us a clue and a hint of what is going to happen later in the story.