I'm usually more interested in experts who are out in the field practising their craft at the coal face, compared to professional presenters/speakers, however on RobinSharma.com there is a post about 53 lessons learned, which has some thought provoking points applicable to coaches. Here are a few I selected:
"Success has less to do with hard work and more to do with massive focus on your few best opportunities."
"Real leaders have the guts to have the hard conversations."
"Self-belief is so incredibly important. Because if you don’t believe you can achieve a vision/goal, then you won’t even start to do the work needed to achieve that vision/goal."
"Our biggest enemy is our own self-doubt. We really can achieve extraordinary things in our lives. But we sabotage our greatness because of our fear."
"You rarely go wrong when you trust yourself."
"Small little details done excellently and consistently stack up into something the world sees as Mastery."
Any coach can see something applicable to their coaching context in that list.