Personal thread component:
High school, post-secondary, graduate... regardless, pick your single best teacher and describe precisely why that person made an impact on you. What specific skill or set of skills - personality, intellect, experience, sense of humour, communication capability, patience, 'other' - made them stand out in your memory?
How can we create an educational system that reinforces and attracts the right people that know how to, and will, provide these things to students? Or, alternately, are students too individual for any single teacher to reach?