It is said that people don't quit companies, they quit bad managers. Similarly, some of you might agree that in school it was not a subject that was boring, but the way the teacher taught it that made all the difference!
In organizations too, Who one learns best from depends on how well the learner and the teacher interact, find common ground, etc. And these factors also affect the motivation of the learner to learn, as well as the motivation of the teacher to share selflessly.