"Every violinist is a Misha or Sasha who has been built up by his parents to be a Heifetz and sweep the world. In the second fiddle section he has to play tremolo—ta-ta-ta. A soloist never plays tremolo. How do I make them like the ta-ta-ta? By building their self-respect, by calling them to my room, by endless talks… [Hearing a great soloist] brings back their childhood memories of how they planned to be soloists. Orchestral work is maybe 75 percent psychology." Said to an interviewer by Artur Rodzinski, conductor of the Cleveland Orchestra, the New York Philharmonic, the Los Angeles Philharmonic, and the Chicago Symphony.
This quote pretty much sums up the view held by conductors and players alike. The Misha and the Sasha he mentions probably refers to Misha Elman and Sasha Jacobsen, just spelled a little differently. I'm guessing about that, of course.