Positive Attitude

At a seudas hoda'ah, a young man who was given no chance of surviving stands up and thanks one doctor at the table for something he heard from his hospital bed six years earlier. Then the doctor stands up to answer him. It is the closing story for Parshas Shelach. The Torah uses three different words for the spying: Vayaturu, Vayachperu and Vayiraglu. Why three, and why does the Kli Yakar say each one fits a different mindset? The same land and the same mission led to very different outcomes, depending on how the people walked in.