Welshman Bale rejoined Spurs from Real Madrid on a season-long loan in September after enduring his worst season in Spain in 2019-20 with three goals in all competitions.
He had a slow start to life back at Spurs due to a knee problem and a lack of first-team football but has rediscovered his form with six goals in the last six games for the club.
"I found psychological scars," Mourinho said. "When you have a couple of seasons with lots of injuries I think it is not about the muscular scars but the psychological scars -- that brings fears and instability.
"There is a moment when you are working very well and everyone around you is giving everything we can give, there is a moment where that psychological barrier has to be broken.
"And he broke it. It was him, not us. We just supported him."