By Mark Schaefer I recently wrote about a special mentor I had in my life when I discussed Robert Crosby and the one word that changed my life. Bob had such an impact on my outlook on life and business. I recently was explaining one of his philosophies to a friend and thought this might be useful to you, too. Bob once told me that there are no such things as personal weaknesses, only over-done strengths. If you think about this as…