Last Thursday, Jimmy Garoppolo agreed to terms on a five-year contract with the 49ers.
Hours before the news broke, Steve Young was asked about San Francisco's franchise quarterback.
"There's nothing to say but positive," Young said on KNBR 680. "So you just have six months to talk positive, build it up ... the biggest thing -- he saw what greatness looks like. He knows what the threshold is.
"When you play that way and prepare that way, you perform that way. You get it."
When Young mentions "greatness," he's referring specifically to Tom Brady.
Garoppolo -- a second round pick (62nd overall) in 2014 -- played sparingly his first two seasons with New England.
But in 2016, he was thrust into action when Brady was suspended to open the season.
Although he made just two starts for the Patriots, Garoppolo was around one of the best to ever do it on a daily basis.
"That's a huge piece of the puzzle," Young added. "A lot of guys are good players, even great players, but they don't know how good you got to be."