"I felt like we weren't going the way I wanted us to," said Mattingly when asked why he wanted a trade. "The Yankees said they had a five-year plan. I didn't have five years." 

From the NY Times, August 16, 1991 on the topic of trading Don Mattingly at the time.  That five-year plan would later turn into four championships in a five year span (and one other championship almost a decade later in 2009 with a core group of players hatched from that original plan).  And a new Yankees' dynasty would be born.  Patience is a good thing.