I mean, reading his book suggestion can't hurt, right?
Worst case, I suppose, is that you get better at tennis. :-)
Gates reads about 50 books a year, and each year at holiday time, he recommends five books as gifts. This year, one of those books is The Inner Game of Tennis by Timothy Gallwey--first published in 1974 and still in print today. Though he picked it up with the intention of improving his game, he quickly discovered it could do much more than that. It helped him vastly improve his self-talk and mental self-discipline. He calls it "the best guide to getting out of your own way."