Some leaders ask team members to jump through hoops and over hurdles in order to prove their worth. As a team member shows promise and results, they devise yet another test to ensure that this colleague is really worth their time and investment. They have to earn every ounce of trust and responsibility this leader might bestow upon them some day in the distant future.
Thinking of all the behaviors a leader has in their kit, this one has to be in the Top 5 most effective? Thinking back on my life, there have been a handful of people outside my immediate family who believed in me like you describe in this post. I would've (still would) go to the ends of the earth if they ask me to.
Listen to the 15 minute daily discussion we had around this Field Notes entry: